CN100444248C

CN100444248C - Magnetic recording/reproducing system

Info

Publication number: CN100444248C
Application number: CNB2006101059046A
Authority: CN
Inventors: 田上胜通; 岛川和也
Original assignee: TDK Corp
Current assignee: TDK Corp
Priority date: 2005-07-11
Filing date: 2006-07-11
Publication date: 2008-12-17
Anticipated expiration: 2026-07-11
Also published as: CN1897120A; JP2007018651A; JP4099180B2

Abstract

The invention is directed to a magnetic recording/reproducing system wherein each burst pattern in discrete media is configured in a substantially trapezoidal shape (truncated quadrangular pyramid shape). W 1 is the upper side of the trapezoidal shape in the track width direction, which corresponds to the surface of said convex-form magnetic recoding layer, W 2 is the lower side of the trapezoidal shape in the track width direction, which corresponds to the bottom surface of said convex-form magnetic layer, Tp is the data track pitch at the data information recording portion, and Wr is the read width of the magnetic head, so that loads on burst pattern shape in medium fabrication processes can be far more reduced and far more precise position error signals can be obtained.

Description

Magnet record playback device

Technical field

The present invention relates to be provided with that magnetic recording layer forms by predetermined relief pattern on substrate, and have the magnetic recording medium (discrete type magnetic recording medium) in so-called servo area and information data zone, and the magnet record playback device of the magnetic head of record and reproducing information data when detecting the servosignal of these medium.

Background technology

In the past, the raising of the area recording density of magnetic recording mediums such as hard disk improved line recording density by (1); (2) improving these two kinds of methods of track density reaches.For realizing the densification of higher level from now on, need to improve recording density based on above-mentioned two kinds of methods.

About improving track density, problem such as obviously have fringe (side fringe) that the expansion because of the processing boundary of magnetic head or magnetic head magnetic field causes, crosstalk can be said based on the raising of the area recording density of the magnetic head high orbit technical progress of the extension of traditional modification method to reach capacity.

On the one hand, as the method that improves line recording density, though realize thin layerization, high-coercivity in traditional longitudinal flux medium, from the medium stability viewpoint of densification and the magnetized heat fluctuation of record more, what gazed at is the perpendicular magnetic recording medium that satisfies these conditions.

Based on such present situation, as the raising area recording density, and the technology of additional magnetic head high orbit densityization, the discrete track dish-type magnetic recording medium that recording layer is formed by predetermined relief pattern has been proposed.For example in Japanese kokai publication hei 11-328662 communique, disclose substrate is implemented in advance predetermined concavo-convex, and along the magnetic recording medium of the vertical magnetosphere of this concavo-convex formation individual layer.

Reach high record densityization and need low spatialization.But the concaveconvex shape of recording layer makes magnetic head can not get stable suspension characteristic, may cause problems such as head crash.Based on such viewpoint, disclosing in Japanese kokai publication hei 10-222944 communique with head gimbal stability is that the record matchmaker of the purpose concaveconvex shape that changes track width direction stops.

In addition, in TOHKEMY 2000-195042 communique, proposed to fill the discrete type magnetic recording medium of the recess of concaveconvex shape, to guarantee the stability of head gimbal characteristic with nonmagnetic substance or other material.

In addition, in Japanese kokai publication hei 6-111502 communique, the technology of reading the relation between the width of burst region pattern width, track pitch and the reproduction head of the tracking servo of the concaveconvex structure of rectangle in the regulation longitudinal recording medium is disclosed.

Generally, in the disk set, on the employed magnetic recording medium, the servo area that magnetic head is followed the tracks of usefulness is recorded by servo track writer.

At servo area, generally there are ISG (Initial Signal Gain) portion, SVAM (SerVoAddress Mark) portion, Gray code portion, burst portion and filling part, they form various magnetic patterns in order to bring into play predetermined function.

In these magnetic patterns, burst portion is recorded with the width of about 1 track pitch on the magnetic recording medium radial direction usually.In addition, ISG portion in addition, SVAM portion, Gray code portion and filling part are recorded continuously at the dish radial direction usually, perhaps are recorded continuously to the minority track at radial direction.

Burst portion is in order to obtain making magnetic head accurately follow the tracks of the pattern of the positional information accurately of orbital position.The pattern of this burst portion is for example by (1) equally first burst region that is provided with of the center line ground of the adjacent track pitch of lion indicator phasing and the group formation of second burst region respectively, (2) or, also additional being positioned at from only stagger the 3rd burst region of position of half track pitch and the group of the 4th burst region of this group constitutes beyond the group of first burst region and second burst region.

One of the tracking action for example down in the combination of the simplest first burst region and second burst region.Promptly, magnetic head is successively by first burst region and second burst region, thereby relatively obtains the value of position error signal PES (Position Error Signal)=(Sa-Sb) from the reproducing signal Sa of the pattern of first burst region and the reproducing signal Sb from the pattern of second burst region according to differential amplifier.Value input servocontrol circuit with this position error signal PES=(Sa-Sb) according to the size of position error signal, drives to follow the tracks of and uses servo-link, thereby make the magnetic head center follow the data-track center.

But the burst region pattern is the pattern of rectangular shape in traditional discrete media, though the rectangular shape pattern to obtaining position error signal ideal accurately, when forming rectangular shape, its shape and size aspect require very high precision.

Require forming accuracy to cause great burden like this to technologic manufacturing.

In order to address this is that, the applicant has proposed Japanese Patent Application 2004-188121 number invention, promptly, magnet record playback device with discrete media of following structure, this discrete media possesses 2 to (2 groups) burst region pattern, this burst region pattern form is made the shape (quadrangular pyramid is trapezoidal) that has the trapezoidal shape of essence on track width direction and track circumference direction respectively, and establishing the top corresponding with convex magnetic recording layer surface in the trapezoidal shape of track width direction is W1, the bottom corresponding with convex magnetic recording layer bottom surface is W2, the data-track pitch of data message recording portion is Tp, magnetic head read width for Wr the time satisfy predetermined relationship.According to this scheme, can provide to adopt to have and make the few burst region pattern form of burden on the technology and also can obtain the magnet record playback device of the magnetic recording medium of the burst region pattern form of position error signal accurately.

Based on such present situation, conceived first group of (1) the application and invented and second group of invention of (2) the application.

(1) purpose of first group of the application invention is: possessing in 2 the discrete media to (2 groups) burst region pattern of having been proposed by the applicant; but also have the best usable range through experimental verification when changing the concerning of track pitch and segmentation pitch, the present patent application is asked for protection the usable range of this expansion.That is, the invention provides magnet record playback device, have also that to make burden on the technology few and can accurately obtain the magnetic recording medium of the burst region pattern form of position error signal even if it adopts further enlarging usable range.

(2) purpose of second group of invention of the application is: when further increasing the burst region pattern, and, the relation of track pitch and segmentation pitch when variation ground of all kinds, provide to adopt to have that to make burden on the technology few and can obtain the magnet record playback device of the magnetic recording medium of the burst region pattern form of position error signal accurately.Can obtain the usage range of position error signal accurately by increasing the burst region pattern, can enlarging, but and the permissible range in the expansion instrument design.

Summary of the invention

Above-mentioned for solving (1) described problem,

The magnet record playback device of first group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region and the 4th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance (2Tp) of 2 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance (2Tp) of 2 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance (1Tp) of 1 track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if W1＞Tp, then satisfy the condition of 1.25W2＞Wr 〉=0.5W2.

In addition, the magnet record playback device of first group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region and the 4th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance ((2/3) Tp) of (2/3) track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance ((2/3) Tp) of (2/3) track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if Tp＞W2, then satisfy the condition of 1.5W2 〉=Wr 〉=0.5W1.

In addition, the ideal form of first group of the application invention is as follows: when establishing from the bottom of convex magnetic recording layer is the height of W2 till the top is W1 when being h, satisfies tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition.

In addition, the ideal form of first group of the application invention is as follows: when establishing the data-track width is that to read width be Wr, when track pitch is Tp, satisfy Wr＜2Tp-W for W, magnetic.

Above-mentioned for solving (2) described problem,

The magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance ((2/3) Tp) of (2/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if Tp＞W2, then satisfy the condition of 2W2＞Wr 〉=0.5W2 and 0.5W2＜W1.

In addition, the magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance ((2/3) Tp) of (2/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if Tp=W2, then satisfy the condition of 2W2-W1 〉=Wr 〉=0.444W2 and 0.444W2＜W1.

In addition, the magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance ((2/3) Tp) of (2/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if Tp=W1, then satisfy the condition of 1.5W1 〉=Wr 〉=0.444W1.

In addition, the magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance (1Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance ((2/3) Tp) of (2/3) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if Tp＜W1, then satisfy the condition of 1.5W1 〉=Wr 〉=0.333W2.

In addition, the magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance ((3/4) Tp) of (3/4) track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance ((3/4) Tp) of (3/4) track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/4) Tp) of (1/4) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance ((3/4) Tp) of (3/4) track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance ((1/2) Tp) of (1/2) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if Tp＞W2, then satisfy the condition of 1.5W2 〉=Wr 〉=0.5W1.

In addition, the magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance ((3/2) Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance ((3/2) Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance ((1/2) Tp) of (1/2) track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance ((3/2) Tp) of 1 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance (1Tp) of 1 track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if W1＞Tp, then satisfy the condition of 1.5W2＞Wr 〉=0.333W2 and 0.333W2＜W1.

In addition, the magnet record playback device of second group of invention of the application is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction, wherein, described data message recording portion possesses the data-track of data-track pitch Tp, describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion, the described servo burst portion that possesses the burst of record tracking usefulness with information portion, described burst portion comprises first burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region, it is right that described first burst region and second burst region are configured to, the position of staggering with the distance (3Tp) of 3 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, it is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering with the distance (3Tp) of 3 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to the stagger position of distance (1Tp) of 1 track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 3rd burst region and the 4th burst region simultaneously, it is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering with the distance (3Tp) of 3 track pitch on track width direction is the magnetic recording layer that center line forms protuberance each other, to be configured to stagger the respectively position of distance (2Tp) of 2 track pitch of the center line from described first burst region and second burst region be the magnetic recording layer that center line forms protuberance for the 5th burst region and the 6th burst region simultaneously, the magnetic recording layer of described protuberance has the trapezoidal shape (quadrangular pyramid is trapezoidal) of essence respectively on track width direction and track circumference direction, on the trapezoidal shape of described track width direction, if with the surperficial corresponding top of convex magnetic recording layer is W1, the bottom corresponding with the bottom surface of convex magnetic recording layer is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, as if W1＞Tp, then satisfy the condition of 1.5W2＞Wr 〉=0.444W2.

In addition, the ideal form of second group of the application invention is as follows: when establishing from the bottom of convex magnetic recording layer is the height of W2 till the top is W1 when being h, satisfies tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition.

In addition, the ideal form of second group of the application invention is as follows: when establishing the data-track width is that to read width be Wr, when track pitch is Tp, satisfy Wr＜2Tp-W for W, magnetic.

Description of drawings

Fig. 1 is the general view of the global shape of expression plate-like magnetic recording medium of the present invention.

Fig. 2 is the local enlarged outline map by the small part of the quadrilateral encirclement of Fig. 1.

Fig. 3 is the cut-open view of the preferred forms of signal magnetic recording medium of the present invention.

Fig. 4 is the cut-open view of the preferred forms of signal magnetic recording medium of the present invention.

Fig. 5 is the general perspective of structure of the perpendicular magnetic recording layer of expression trapezoidal shape.

Fig. 6 is the general perspective of magnet record playback device.

When Fig. 7 is so-called M=2, n=1 with the structure of burst portion and the general view that draws with the relation of track pitch.

When Fig. 8 is so-called M=2, n=3 with the structure of burst portion and the general view that draws with the relation of track pitch.

Fig. 9 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 10 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 11 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 12 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 13 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 14 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 15 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 16 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 17 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 18 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 19 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 20 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 21 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 22 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 23 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 24 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 25 is the cross section mode chart along the A-A ' arrow of Fig. 9.

Figure 26 is the diagrammatic sketch of the definition of explanation " reading width W r ".

Figure 27 is that explanation magnetic is read the diagrammatic sketch of the upper bound condition of width W r.

Figure 28 is the general view of expression plate-like magnetic recording medium global shape of the present invention.

Figure 29 is the local enlarged outline map by the small part of the quadrilateral encirclement of Figure 28.

Figure 30 is the cut-open view of the preferred forms of signal magnetic recording medium of the present invention.

Figure 31 is the cut-open view of the preferred forms of signal magnetic recording medium of the present invention.

Figure 32 is the general perspective of structure of the perpendicular magnetic recording layer of expression trapezoidal shape.

Figure 33 is the general perspective of magnet record playback device.

Figure 34 illustrates possesses 3 configuration relations to burst region pattern pitch Bp in the burst portion of (3 groups) burst region pattern and data-track pitch Tp, especially when the logarithm of representing the burst region pattern with M (group number), the occasion of M=3 and the n=3 the when relational expression of burst region pattern pitch Bp and data-track pitch Tp is expressed as Bp=(3/n) Tp.

Figure 35 illustrates possesses 3 configuration relations to burst region pattern pitch Bp in the burst portion of (3 groups) burst region pattern and data-track pitch Tp, especially when the logarithm of representing the burst region pattern with M (group number), the occasion of M=3 and the n=4 the when relational expression of burst region pattern pitch Bp and data-track pitch Tp is expressed as Bp=(3/n) Tp.

Figure 36 illustrates possesses 3 configuration relations to burst region pattern pitch Bp in the burst portion of (3 groups) burst region pattern and data-track pitch Tp, especially when the logarithm of representing the burst region pattern with M (group number), the occasion of M=3 and the n=2 the when relational expression of burst region pattern pitch Bp and data-track pitch Tp is expressed as Bp=(3/n) Tp.

Figure 37 illustrates possesses 3 configuration relations to burst region pattern pitch Bp in the burst portion of (3 groups) burst region pattern and data-track pitch Tp, especially when the logarithm of representing the burst region pattern with M (group number), the occasion of M=3 and the n=1 the when relational expression of burst region pattern pitch Bp and data-track pitch Tp is expressed as Bp=(3/n) Tp.

Figure 38 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 39 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 40 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 41 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 42 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 43 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 44 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 45 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 46 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 47 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 48 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 49 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 50 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 51 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 52 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 53 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 54 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 55 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 56 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 57 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 58 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 59 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 60 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 61 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 62 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 63 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 64 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 65 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 66 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 67 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 68 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 69 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 70 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 71 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 72 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 73 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 74 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 75 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 76 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 77 illustrates concrete experiment form, and signal is read W1, the W2 of burst region pattern of width W r and the relation of track pitch Tp for magnetic, also describes position error signal PES simultaneously.

Figure 78 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 79 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 80 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 81 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 82 is depicted as the angle interdependence on trapezoidal inclined-plane of investigation trapezoidal pattern and the experiment form implemented.

Figure 83 is the cross section mode chart along the A-A arrow of Figure 38.

Figure 84 is the diagrammatic sketch of the definition of explanation " reading width W r ".

Figure 85 is that explanation magnetic is read the diagrammatic sketch of the upper bound condition of width W r.

Embodiment

Below, be elaborated with regard to embodiments of the present invention.

At first, begin that first group of invention is elaborated to the application.

(1) the application's first group of invention

Be provided with in the magnet record playback device of the present invention: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium of usefulness with information portion; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head of described data message recording portion and reproduction.

At first, beginning is in order to hold the device one-piece construction, by the explanation of Fig. 6 explanation to the schematic configuration example of magnet record playback device.

(explanation of the schematic configuration example of magnet record playback device)

It is the schematic configuration skeleton view of magnet record playback device that Fig. 6 illustrates the best example of the present invention.Among this figure, adopt plate-like perpendicular magnetic recording medium (discrete media) as magnetic recording medium 1, these medium are driven by Spindle Motor 2 rotations.

In addition, for magnetic recording medium being carried out reading or writing of data, the front end of the swivel arm 4 that direction is extended in the direction medium outside medium is provided with the magnetic head 5 that record-playback is used.Swivel arm 4 rotates by voice coil motor 3, and for example the servosignal that detects of the magnetic head of using based on record-playback 5 can be positioned magnetic head 5 on the planned orbit.

The magnetic head 5 that record-playback is used is provided with recording element and rendering element, adopts for example single magnetic pole head of main pole exciting type as recording element, and adopts for example GMR (giant magnetoresistance effect) head as rendering element.Replace the GMR head, also can adopt TMR (tunnel magneto-resistance effect) first-class.

Also have, exemplify perpendicular magnetic recording medium as the best one of magnetic recording medium of the present invention and describe, but also applicable so-called longitudinal recording medium.

(explanation of magnetic recording medium)

Below, describe with regard to the structure of magnetic recording medium.

Fig. 1 is the general view of the global shape of the plate-like magnetic recording medium 1 that uses among the present invention of expression, and Fig. 2 illustrates the local enlarged outline map of the small part 100 of being surrounded by quadrilateral of Fig. 1.The zone that servosignal has been write down in main signal among Fig. 2 is that the servo data track group of using with information portion 90 and record-playback is a data message recording portion 80.

Fig. 3 illustrates the cut-open view of the preferred forms of magnetic recording medium among the present invention, and Fig. 3 is equivalent to the cut-open view along α-α arrow of Fig. 2 basically.

Though not shown in Fig. 1, a plurality of data track group concentric circles configurations that record-playback is used on the disc board also form.

In addition, from disk center's outward direction, radial formation servosignal zone is (servo with information portion 90: the position of drawing with the radiation wire among the figure).That is, use the so-called sector servo mode that card is cut apart with the sector.Also have, magnetic recording medium servo with on the information portion 90, with the servo tracking recorder trace servo-information.

If describe the structure of servo usefulness information portion 90 in detail, then servo usefulness information portion 90 (so-called servo area) comprises ISG portion 91, SVAM portion 92, Gray code portion 93, burst portion 94 and filling part 95 as shown in Figure 2.

ISG (Initial Signal Gain) portion 91 is for the magnetic characteristic of the magnetic film (magnetosphere) of getting rid of magnetic recording medium or the continuous pattern that the irregular influence that causes of head gimbal amount is provided with, and forms continuously in the orbit radius direction.During with the such ISG portion 91 of magnetic head reproduction, in order to proofread and correct the output bias of magnetic recording medium or magnetic head, the servo demodulation circuit is determined gain according to automatic gain control (AGC).The automatic gain control (AGC) that plays this effect disconnected in the moment that detects SVAM (the SerVo Address Mark) portion 92 that is present in servo area, and the amplitude with ISG portion 91 will be present in the reproduction amplitude normalization of burst portion 94 later on.

Write down the information of each orbital number information and sector number in the Gray code portion 93.

Burst portion 94 is in order to obtain making magnetic head accurately follow the tracks of the pattern of the positional information accurately of orbital position.This pattern is for example shown in Figure 2, is constituted by following, promptly strides first burst region 94a of setting equidistantly and a group (they become a pair of) of the second burst region 94b respectively on the basic center line of 2 track pitch at interval; And from this group stagger the 3rd burst region 94c that the position of 1 track pitch exists and a group (they become a pair of) of the 4th burst region 94d.

In other words as an embodiment shown in Figure 2, it is the magnetic recording layer (Bp=2Tp that center line forms protuberance respectively with the position of 2 track pitch that stagger that the first burst region 94a and the second burst region 94b are configured to each other at track width direction; Bp represents the pitch of burst region pattern, Tp represents track pitch), it is the magnetic recording layer (Bp=2Tp) that center line forms protuberance that the 3rd burst region 94c and the 4th burst region 94d are configured to the stagger position of 1 track pitch of the center line from the first burst region 94a and the second burst region 94b.The radial direction length of the first burst region 94a, the second burst region 94b, the 3rd burst region 94c and the 4th burst region 94d is the length of 2 tracks.Also have, the 4th burst region 94d has only put down in writing the length of 1 track on radial direction according to the paper situation of Fig. 2.

In addition, as shown in the figure, the first burst region 94a～the 4th burst region 94d is the status pattern configuration that moves of lateral deviation downstream successively.

Also have, in this instructions, the first burst region 94a～the 4th burst region 94d is also referred to as first burst region track (VTR1)～the 4th burst region track (VTR4), but this is a synonym.

In addition, for 2 the burst portions that are provided with of the present invention to (2 groups) burst region pattern, the pitch Bp of the above-mentioned paired like that burst region pattern when research Bp=2Tp and Bp=(2/3) Tp and the relation of track pitch Tp, specifically as described later.

Filling part 95 be for the delay that absorbs the demodulator circuit system with can maintain the servo demodulation circuit reproduce servo area during clock generate the pattern that is provided with.

ISG portion 91, SVAM portion 92, filling part 95 are recorded continuously at the dish radial direction.In addition, Gray code portion 93 is also writing down more than the number track on the radial direction at least.

The optimal cross section structure of one routine magnetic recording medium then, is described based on Fig. 3.Fig. 3 for example can regard the cut-open view of Fig. 2 along α-α arrow as.

As shown in Figure 3, be provided with in the magnetic recording medium: substrate 15; The oriented layer 14 that on this substrate 15, forms; The soft ferromagnetic layer 11 that on this oriented layer 14, forms; The middle layer 12 that on this soft ferromagnetic layer 11, forms; That on this middle layer 12, form, suitable perpendicular magnetic recording layer 10 and the nonmagnetic layer 20 suitable with recess with concavo-convex protuberance; With and the protective seam 13 that go up to form.

As substrate 15, be fit to adopt glass substrate, NiP lining aluminium alloy base plate, Si substrate etc.As oriented layer 14, for example can adopt the antiferromagnetic material that to give the PtMn etc. in magnetic anisotropy magnetic field to the track width direction of soft ferromagnetic layer 11.In addition, can be the nonmagnetic alloy that is orientated in order to control.

As soft ferromagnetic layer 11, can enumerate multilayer film, soft magnetism magnetic ferrites of CoZrNb alloy, Fe class alloy, Co class amorphous alloy, soft magnetism/nonmagnetic layer etc.In addition, can be the stepped construction of using soft ferromagnetic layer clamping nonmagnetic layer.

Middle layer 12 is to be provided with for the perpendicular magnetic anisotropic of controlling the perpendicular magnetic recording layer that forms on this middle layer and crystal particle diameter, adopts for example CoTi nonmagnetic alloy.In addition, can adopt the alloy of the nonmagnetic metal, alloy or the low permeability that play same effect.

As the perpendicular magnetic recording layer 10 of protuberance, be fit to adopt SiO ₂Oxide material in contain artificial grid type multilayer alloy of the medium of ferromagnetism particles such as rectangular CoPt or CoCr class alloy, FePt alloy, Co/Pd class etc.As described later, be trapezoidal shape as the recording layer 10 that servosignal takes place works among the present invention.

As the material of the nonmagnetic layer 20 of recess, adopt SiO ₂, Al ₂O ₃, TiO ₂, nonmagnetic oxide such as magnetic ferrites; Nitride such as AlN; Carbonide such as SiC.

On nonmagnetic layer 20 surfaces of the perpendicular magnetic recording layer 10 or the recess of protuberance, utilize CVD method etc. to form the protective seam 13 of carbon film etc. usually.

Based on the formation (formation of so-called discrete type medium) of the perpendicular magnetic recording layer 10 and the nonmagnetic layer 20 of relief pattern, for example by behind the perpendicular magnetic recording layer 10 of predetermined concavo-convex shape etching certain thickness film forming, the SiO that sputter is corresponding with etch depth ₂, the recess after the etching is filled.Remove the SiO of unnecessary deposit on the perpendicular magnetic recording layer 10 when then, medium can be rotated with oblique ion beam etching method etc. ₂Thereby, with whole media surface planarization.

Also have, etch processes based on formation (formation of the so-called discrete type medium) usefulness of the perpendicular magnetic recording layer 10 and the nonmagnetic layer 20 of relief pattern among Fig. 3, terminate in the bottom of recording layer, but also can further enter the such etch processes in soft ferromagnetic layer 11 zones, make relief pattern.

Fig. 4 illustrates the variation of Fig. 3.The embodiment of Fig. 4 and the difference of Fig. 3 are: by perpendicular magnetic recording layer 10 etchings of predetermined concavo-convex shape after the time with the certain thickness film forming, in the scope that does not influence magnetic characteristic than the magnetosphere of the residual recess location of unfertile land.The form of Fig. 4 and Fig. 3 is embodiments of the present invention, represents same parts at the prosign of Fig. 4 and Fig. 3 employing.

(specification of servo area (the servo information portion of using) is set)

Main points of the present invention are: (1) can be obtained technologic dimensional accuracy tolerance limit and alleviate on the precision aspect and make burden; (2) for obtaining to follow the tracks of the purpose of position error signal accurately of usefulness, the burst region pattern of the burst portion on the servo area of discrete media is made 2 to (2 groups) burst region pattern, simultaneously each burst region pattern form is made the shape (quadrangular pyramid is trapezoidal) that possesses the trapezoidal shape of essence in track width direction and track circumference direction respectively, top corresponding with convex magnetic recording layer surface in the trapezoidal shape of establishing track width direction is W1, the bottom corresponding with convex magnetic recording layer bottom surface is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, can satisfy predetermined relationship ground and set media structure.Also have, in the perpendicular magnetic recording layer of trapezoidal shape, the angle of top can be sagging a little.

Also have, magnetic head of the present invention is read width W r (the reproduction track width of magnetic head) with so-called different with the optical dimensions width of actual measurements such as SEM, is defined as follows.

That is, form, magnetic head is moved successively by track width direction, measure the reproduction output V of magnetic head than writing fully little minisize track of track width _OutBy the track profile, with V _OutMaximal value (V _{Out MAX}) 1/2 output valve (V _{Out MAX}/ 2) width (so-called half value is wide) is defined as " reading width W r ".The constitutional diagram of the definition of " reading width W r " is shown at Figure 26.

In 2 couple (2 groups) burst region pattern of burst of the present invention portion, each is identical respectively to (each group) burst region pattern pitch Bp, and each of regulation burst region pattern pitch Bp disposes (each group) center line (1/2) Bp ground that staggers successively.In addition, for the data-track pitch Tp of data message recording portion, burst region pattern pitch Bp is defined as various values.Occasion of the present invention divides two kinds of occasions of Bp=2Tp, Bp=(2/3) Tp to study.

Main points of the present invention are: in both cases, each burst region pattern form is made the shape (quadrangular pyramid is trapezoidal) that on track width direction and track circumference direction, has the trapezoidal shape of essence respectively, when top corresponding in the trapezoidal shape of establishing track width direction with convex magnetic recording layer surface be W1, with the corresponding bottom in convex magnetic recording layer bottom surface be the data-track pitch of W2, above-mentioned data message recording portion when being reading width and being Wr of Tp, magnetic head, can satisfy predetermined relationship ground setting media structure.

Also have, the explanation that specifications such as relevant burst region pattern are set, think by with reference to and the experimental result of studying specific embodiment understand easily, so, the present invention is described below with reference to the various experimental examples of intersection embodiment and comparative example.

(I) experimental example 1

Occasion as M=2, n=1

As Fig. 2 or shown in Figure 7, when the logarithm of representing the burst region pattern with M (group number), M=2 is the occasion of the n=1 the when relational expression of burst region pattern pitch Bp and data-track pitch Tp is represented Bp=(2/n) Tp.In other words, be that the pass of burst region pattern pitch Bp and data-track pitch Tp is the occasion of Bp=2Tp in possessing 2 burst portions to (2 groups) burst region pattern.

In this example, it is right that first burst region (VTR1) 94a and second burst region (VTR2) 94b are configured to, and the position with the distance (2Tp) of 2 track pitch that stagger is the magnetic recording layer that center line forms protuberance on track width direction each other.

It is right that the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance (2Tp) of 2 track pitch that stagger each other, to be configured to the stagger position of distance (1Tp) of 1 track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d simultaneously.

(structure of magnetic recording medium)

As shown in Figure 1, cut apart card,, form servo area 90 as shown in Figure 2 for the servo mode of applicable sector with the sector.That is,, form ISG portion 91, SVAM portion 92, Gray code portion 93, burst portion 94 and filling part 95 according to the pattern of each servosignal.

The magnetic recording layer (convex magnetic recording layer) of the protuberance of the burst portion 94 of record burst makes the perpendicular magnetic recording layer of trapezoidal shape as shown in Figure 5.The top corresponding with convex magnetic recording layer surface is of a size of W1, and the bottom corresponding with convex magnetic recording layer bottom surface is of a size of W2, is that W2 is that the height of W1 is h to the top by bottom, in addition, and W2＞W1.

Protuberance in ISG portion 91, SVAM portion 92, Gray code portion 93 and the filling part 95 beyond burst portion 94 becomes the banded protuberance perpendicular magnetic recording layer (not shown) at the long trapezoidal shape of dish radial direction, disposes every 1 bit interval.

The cross sectional shape of medium as shown in Figure 3, on the glass substrate 15 of mirror ultrafinish, form PtMn layer 15nm thickness, as oriented layer 14 (bedding course 14), form the soft ferromagnetic layer 11 that constitutes by CoZrNb on it and be 200nm thickness, and then form the middle layer 12 that constitutes by nonmagnetic alloy CoTi thereon and be 8nm thickness.Then form perpendicular magnetic recording layer 10 thereon for behind the 15nm thickness, carry out the etch processes of predetermined pattern for making predetermined concavo-convex shape.Then, be the recess sputter SiO after the filling etching ₂Then, on one side rotation fill SiO ₂Medium, handle Yi Bian carry out the oblique ion beam etching, remove the unnecessary SiO that forms on the perpendicular magnetic recording layer 10 ₂, with the media surface planarization.The diaphragm 13 that forms the carbon film with the CVD method thereon is 1nm thickness, and applying lubricant (Fomblin class) in addition is 1nm thickness, finishes the medium sample.Also have, perpendicular magnetic recording layer 10 adopts SiO ₂In the rectangular material that comprises the ferromagnetism particle of CoPt.

As the result who measures the magnetic characteristic of perpendicular magnetic recording layer with test portion oscillating mode magnetometer (VSM), saturated magnetization Ms is that 350emu/cc, residual saturated magnetization Mr are 340emu/cc.The thickness of perpendicular magnetic recording layer (highly) h is made as 15nm as described above.

If the recording density of servosignal is 130KFRPI (Flux Reversal Per Inch).In addition, the track pitch Tp that establishes the data area for and the suitable 100nm of 254KTPI (Track Per Inch).If the width of the track on the data area (data-track (DTR)) is 70nm.

The top W1 of the perpendicular magnetic recording layer of the trapezoidal shape suitable and the length of following W2 with burst region pattern shown in Figure 5, etching condition when changing the concaveconvex structure shaping, and be benchmark with the value of the track pitch Tp of data-track, increase or reduce the experiment segmentation that size forms various forms shown in the following table 1 by this benchmark.If the trapezoidal inclined-plane of trapezoidal shape and bottom surface angulation are 50 ° in whole experimental examples.That is, make the shape that satisfies tan50 °=2h/ (W2-W1).

Experiment makes above-mentioned M=2, the form of n=1 (Fig. 7) with the form of segmentation.Pattern for data-track (DTR) 80, dispose first burst region track (VTR1) 94a, second burst region track (VTR2) 94b, the 3rd burst region track (VTR3) 94c, the 4th burst region track (VTR4) 94d, synthetic by the differential signal from VTR1 and VTR2 that will output to head position with differential signal from VTR3 and VTR4, generate accurate PES signal.

In addition, record adopts magnetic to write the film inductive head of width 80nm with magnetic head.Reproduction is adopted giant magnetoresistance effect (GMR) head with magnetic head.It is as shown in table 1 to also have reproduction to read width W r with the magnetic of magnetic head, adopts various width according to the relation with other parameter (W1, W2, Tp).

Through the perpendicular magnetic recording medium of concavo-convex processing, carry out the perpendicular magnetic recording layer of protuberance is magnetized and the processing in generation servosignal magnetic field as above-mentioned predetermined servo area and data area.That is, between the magnetic pole of the electromagnet that D.C. magnetic field 15kOe produces, card and pole surface are set abreast after, make that the perpendicular magnetic recording layer of trapezoidal shape of servo area and data area is unified is with magnetic, thus with recorded servo signal.

Like this, utilize the magnetic recording medium of experimental example 1 usefulness of having prepared, carry out the experiment of tracking Control by following main points.

Promptly, at discrete track dish shown in the following table 1, read with in the magnetic head, with track pitch Tp is benchmark, obtain whole position error signal PES of combination of each element size relation of W1, W2, Wr, consider the degree of admission of the linearity of PES in adjacent orbital position change as tracking characteristics, and spendable judgement could be shown in the table with " service rating " whether.

In addition, the relation of the W1 that implements in the respective figure in the table 1, W2, Tp and Tr illustrates in pattern accompanying drawing mode, therefore please refer to corresponding accompanying drawing.In addition, the PES signal is also simultaneously shown in the drawings.

Table 1 (M=2; N=1)

The condition of table 1 illustrated embodiment I-1 is under the condition of W1＞Tp, and investigation changes when magnetic read concerning of the burst region pattern of width W r and W1, W2 and track pitch Tp position error signal PES and how to change and obtain.Each routine corresponding diagram is respectively Fig. 9～Figure 13.

By Fig. 9～Figure 13 as can be known, in the scope of " occasion of W1＞Tp, 1.25W2＞Wr 〉=0.5W2 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

As shown in Figure 7, the structure when M=2, n=1 can only be considered the occasion of above-mentioned W1＞Tp.

Also have, Figure 25 illustrate Fig. 9 along A-A arrow cross section mode chart.The prosign that is marked on Fig. 9 and Fig. 3 is represented same member.

(II) experimental example 2

The occasion of M=2, n=3

As shown in Figure 8, when the logarithm of representing the burst region pattern with M (group number), M=2 is shown, and the occasion of n=3 when the relational expression between burst region pattern pitch Bp and the data-track pitch Tp is expressed as Bp=(2/n) Tp.That is, in possessing 2 burst portions to (2 groups) burst region pattern, burst region pattern pitch Bp is 2/3 times the occasion (Bp=(2/3) Tp) of data-track pitch Tp.

In this example, as shown in Figure 8, it is right that first burst region (VTR1) 94a and second burst region (VTR2) 94b are configured to, and the position with the distance ((2/3) Tp) of (2/3) track pitch that staggers is the magnetic recording layer that center line forms protuberance on track width direction each other.

In addition, it is right that the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance ((2/3) Tp) of (2/3) track pitch that staggers each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d simultaneously.

(structure of magnetic recording medium)

The burst portion structure (M=2, n=1) of the magnetic recording medium in the above-mentioned experimental example 1 is changed over the structure (Fig. 8) of above-mentioned M=2, n=3 occasion.In addition, according to the same main points of above-mentioned experimental example I, made in the experimental example 2 magnetic recording medium that uses.The magnetic recording medium that utilization is used in this experimental example 2 carries out the experiment of tracking Control according to above-mentioned experimental example 1.

Promptly, at discrete track dish shown in the following table 2, read with in the magnetic head, with track pitch Tp is benchmark, obtain whole position error signal PES of combination of each element size relation of W1, W2, Wr, as tracking characteristics with the linearity of PES spendable judgement could be shown in the table whether with " service rating ".

In addition, the relation of the W1 that implements in the respective figure in the table 2, W2, Tp and Tr illustrates in pattern accompanying drawing mode, therefore please refer to corresponding accompanying drawing.In addition, the PES signal is also simultaneously shown in the drawings.

Table 2 (M=2; N=3)

The condition of table 2 illustrated embodiment II-1 is under the condition of Tp＞W2, and how position error signal PES changed and obtain when investigation changed the burst region pattern that magnetic is read width W r and concerns with W1, W2 and track pitch Tp.Each routine corresponding diagram is respectively Figure 14～Figure 19.

By Figure 14～Figure 19 as can be known, in the scope of " occasion of Tp＞W2,1.5W2 〉=Wr 〉=0.5W1 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

As shown in Figure 8, the structure when M=2, n=3 can be considered the occasion of above-mentioned Tp＞W2.

(III) experimental example 3

Carry out experiment to the angle interdependence on the inclined-plane of trapezoidal shape.That is, under the situation of the lower limit condition Wr=0.5W1 (Figure 10) of the embodiment I-1 in above-mentioned table 1, the angle interdependence on the inclined-plane of investigation trapezoidal shape pattern.

The result of angle interdependence on the trapezoidal inclined-plane of the trapezoidal pattern of investigation shown in the following table 3.The accompanying drawing of PES when Figure 20～Figure 24 illustrates angle θ with the inclined-plane of trapezoidal pattern and is set at 21 °, 31 °, 38.7 °, 50 °, 85 °.In the table 3,, but the occasion of service rating is marked " zero " based on the viewpoint of linearity, and the mark " * " that is difficult to use linearly.

Table 3

Bevel angle	21°	31°	38.7°	50°	85°
Bevel angle	21°	31°	38.7°	50°	85°	Service rating	Not (*)	Not (*)	Not (*)	Can (zero)	Can (zero)
Respective figure	Figure 20	Figure 21	Figure 22	Figure 23	Figure 24	Service rating	Not (*)	Not (*)	Not (*)	Can (zero)	Can (zero)

Based on the result of table 3, in the pattern of trapezoidal shape, even if the occasion of condition strictness, especially the angle of the inclined-plane of the trapezium structure on the track width direction and bottom surface preferably also has the angle more than 50 ° at least.Maximum bevel angle is preferably in below 85 °.

That is, be the height of W2 till the top is W1 when being h when establishing by convex magnetic recording layer bottom, preferably tan85 ° 〉=2h/ (W2-W1) 〉=tan50 °, if tan80 ° 〉=2h/ (W2-W1) 〉=tan70 ° is then better.

By above result, effect of the present invention is with clear.Promptly, among the present invention the burst region pattern form on the discrete media is set as the shape (quadrangular pyramid is trapezoidal) that on track width direction and track circumference direction, has the trapezoidal shape of essence respectively, establishing the top corresponding with convex magnetic recording layer surface in the trapezoidal shape of track width direction is W1, the bottom corresponding with convex magnetic recording layer bottom surface is W2, the data-track pitch of data message recording portion is Tp, magnetic head read width for Wr the time satisfy predetermined relationship, therefore can provide to be provided with to obtain to a certain degree technologic dimensional accuracy tolerance limit and make burden to alleviate, and can obtain accurately the magnetic recording medium of the burst region pattern form of position error signal and the magnet record playback device that adopts this magnetic recording medium.

Also have, in the magnetospheric form of the such residual part of Fig. 4, stay thin residual magnetism layer and hardly magnetic characteristic is exerted an influence, therefore can think that the bottom corresponding with the bottom surface of the convex magnetic recording layer of ignoring nubbin is W2, use the present invention.

Also have, above-mentioned experimental example is the condition of the linearity of adhering to guaranteeing position error signal (PES), and in actual device, additional read head width W r (magnetic is read width W r) can not directly reproduce the condition of adjacent data tracks.

That is, be W when establishing the data-track width, when track pitch is Tp, need the condition of Wr＜2Tp-W.In other words, as shown in figure 27, be that magnetic is read the condition that width W r does not cross over adjacent 2 data tracks.

As mentioned above, first group of invention of the application possesses has arranged 2 pairs of burst region patterns on the discrete media, the shape of this burst region pattern makes the shape (quadrangular pyramid is trapezoidal) that has the trapezoidal shape of essence on track width direction and track circumference direction respectively, establishing the top corresponding with convex magnetic recording layer surface in the trapezoidal shape of track width direction is W1, the bottom corresponding with convex magnetic recording layer bottom surface is W2, the data-track pitch of data message recording portion is Tp, magnetic head read width for Wr the time satisfy predetermined relationship, therefore can provide to be provided with to obtain to a certain degree technologic dimensional accuracy tolerance limit and make burden to alleviate, and can obtain accurately the magnetic recording medium of the burst region pattern form of position error signal and the magnet record playback device that adopts this magnetic recording medium.

Below, just second group of invention of the application is elaborated.

(2) the application's second group of invention

At first, begin most in order to hold the device one-piece construction, by the explanation of Figure 33 explanation the schematic configuration example of magnet record playback device.

It is the schematic configuration skeleton view of magnet record playback device that Figure 33 illustrates the best example of the present invention.Among this figure, adopt plate-like perpendicular magnetic recording medium (discrete media) as magnetic recording medium 1, these medium are driven by Spindle Motor 2 rotations.

In addition, for magnetic recording medium being carried out reading or writing of data, the front end of the swivel arm 4 that extend the side in the direction medium outside medium is provided with the magnetic head 5 that record-playback is used.Swivel arm 4 rotates by voice coil motor 3, and for example the servosignal that detects of the magnetic head of using based on record-playback 5 can be positioned magnetic head 5 on the planned orbit.

The magnetic head 5 that record-playback is used is provided with recording element and rendering element, adopts for example single magnetic pole head of main pole exciting type as recording element, and adopts for example GMR (giant magnetoresistance effect) head as rendering element.Replace the GMR head, can adopt TMR (tunnel magneto-resistance effect) first-class.

Also have, exemplify perpendicular magnetic recording medium as the best one of magnetic recording medium of the present invention and describe, but also applicable longitudinal recording medium.

(explanation of magnetic recording medium)

Below, describe with regard to the structure of magnetic recording medium.

Figure 28 is the general view of the global shape of the plate-like magnetic recording medium 1 that uses among the present invention of expression, and Figure 29 illustrates the local enlarged outline map of the small part 100 of being surrounded by quadrilateral of Figure 28.The zone that servosignal has been write down in main signal among Figure 29 is that the servo data track group of using with information portion 90 and record-playback is a data message recording portion 80.

Figure 30 illustrates the cut-open view of the preferred forms of magnetic recording medium among the present invention, and Figure 30 is equivalent to the cut-open view along α-α arrow of Figure 29 basically.

Though not shown in Figure 28, a plurality of data-track configuration set that record-playback is used on the disc board also form concentric circles.

In addition, to foreign side, radial formation servosignal zone is (servo with information portion 90: the position of drawing with the radiation wire among the figure) from disk center.That is, use the so-called sector servo mode that card is cut apart with the sector.Also have, magnetic recording medium servo with on the information portion 90, with the servo tracking recorder trace servo-information.

ISG (Initial Signal Gain) portion 91 is for the magnetic characteristic of the magnetic film (magnetosphere) of getting rid of magnetic recording medium or the continuous pattern that the irregular influence that causes of head gimbal amount is provided with, and forms continuously in the orbit radius direction.During with the such ISG portion 91 of magnetic head reproduction, owing to proofread and correct the output bias of magnetic recording medium or magnetic head, the servo demodulation circuit is determined to gain according to automatic gain control (AGC).The automatic gain control (AGC) that plays this effect disconnected in the moment that detects SVAM (the SerVo Address Mark) portion 92 that is present in servo area, and the amplitude with ISG portion 91 will be present in the reproduction amplitude normalization of burst portion 94 later on.

Burst portion 94 is in order to obtain making magnetic head accurately follow the tracks of the pattern of the positional information accurately of orbital position.This pattern is for example shown in Figure 29, is constituted by following, promptly strides first burst region 94a of setting equidistantly and a group (they become a pair of) of the second burst region 94b respectively on the center line of restriction adjacent orbit pitch; From the 3rd burst region 94c that exists respectively on this group staggers the position of (1/3) and (2/3) track pitch and a group (they become a pair of) of the 4th burst region 94d; And the 5th burst region 94e and the 6th burst region 94f one group (their become a pair of).

In other words, as an embodiment shown in Figure 29, it is the magnetic recording layer (the pitch Bp=track pitch Tp of burst region pattern) that center line forms protuberance respectively with the position of 1 track pitch that staggers that the first burst region 94a and the second burst region 94b are configured to each other at track width direction, it is the magnetic recording layer (Bp=Tp) that center line forms protuberance that the 3rd burst region 94c and the 4th burst region 94d are configured to the stagger position of (1/3) track pitch of the center line from the first burst region 94a and the second burst region 94b, and it is the magnetic recording layer (Bp=Tp) that center line forms protuberance that the 5th burst region 94e and the 6th burst region 94f are configured to the stagger position of (2/3) track pitch of the center line from the first burst region 94a and the second burst region 94b.

Also have, as shown in the figure, the first burst region 94a～the 6th burst region 94f carries out pattern arrangement with the state that is offset in the downstream successively.

Also have, in this instructions, the first burst region 94a～the 6th burst region 94f is also referred to as first burst region track (VTR1)～the 6th burst region track (VTR6), but this is a synonym.

In addition,, be not limited to the pitch Bp occasion consistent of above-mentioned like that paired burst region pattern, can be form in addition with track pitch Tp for 3 the burst portions that are provided with of the present invention to (3 groups) burst region pattern.For all forms, will describe in detail in the back.

The cross section structure of one routine magnetic recording medium the best then, is described based on Figure 30.Figure 30 for example can regard as Figure 29 along α-α arrow cut-open view.

As shown in figure 30, be provided with in the magnetic recording medium: substrate 15; The oriented layer 14 that on this substrate 15, forms; The soft ferromagnetic layer 11 that on this oriented layer 14, forms; The middle layer 12 that on this soft ferromagnetic layer 11, forms; That on this middle layer 12, form, suitable perpendicular magnetic recording layer 10 and the nonmagnetic layer 20 suitable with recess with concavo-convex protuberance; With and the protective seam 13 that go up to form.

As substrate 15, be fit to adopt glass substrate, NiP lining aluminium alloy base plate, Si substrate etc.As oriented layer 14, for example can adopt the antiferromagnetic material that to give the PtMn etc. in magnetic anisotropy magnetic field to the track width direction of soft ferromagnetic layer 11.In addition, can be the nonmagnetic alloy that is orientated in order to control.In addition, can be the stepped construction of using soft ferromagnetic layer clamping nonmagnetic layer.

As soft ferromagnetic layer 11, can enumerate multilayer film, soft magnetism magnetic ferrites of CoZrNb alloy, Fe class alloy, Co class amorphous alloy, soft magnetism/nonmagnetic layer etc.

As the perpendicular magnetic recording layer 10 of protuberance, be fit to adopt SiO ₂Oxide material in the artificial grid type multilayer alloy etc. of the rectangular medium that contain ferromagnetism particles such as CoPt or CoCr class alloy, FePt alloy, Co/Pd class.As described later, be trapezoidal shape as the recording layer 10 that servosignal takes place works among the present invention.

Also have, etch processes based on formation (formation of the so-called discrete type medium) usefulness of the perpendicular magnetic recording layer 10 and the nonmagnetic layer 20 of relief pattern among Figure 30, terminate in the bottom of recording layer, but also can further enter the such etch processes in soft ferromagnetic layer 11 zones, make relief pattern.

Figure 31 illustrates the variation of Figure 30.The embodiment of Figure 31 and the difference of Figure 30 are: by perpendicular magnetic recording layer 10 etchings of predetermined concavo-convex shape after the time with the certain thickness film forming, in the scope that does not influence magnetic characteristic than the magnetosphere of the residual recess location of unfertile land.The form of Figure 31 and Figure 30 is embodiments of the present invention, and the prosign that Figure 31 and Figure 30 adopt is represented same parts.

(specification of servo area (the servo information portion of using) is set)

Main points of the present invention are: (1) can be obtained technologic dimensional accuracy tolerance limit and alleviate on the precision aspect and make burden; (2) for obtaining to follow the tracks of the position error signal accurately of usefulness; And (3) expansion can obtain the usage range of position error signal accurately, and the permissible range purpose in the expansion instrument design, the burst region pattern of the burst portion on the servo area of discrete media is made 3 to (3 groups) burst region pattern, simultaneously each burst region pattern form is made at track width direction and track circumference direction and distinguish the still shape of the trapezoidal shape of essence (quadrangular pyramid is trapezoidal) of tool, top corresponding with convex magnetic recording layer surface in the trapezoidal shape of establishing track width direction is W1, the bottom corresponding with convex magnetic recording layer bottom surface is W2, the data-track pitch of data message recording portion is Tp, during the reading width and be Wr of magnetic head, can satisfy predetermined relationship ground and set media structure.Also have, in the perpendicular magnetic recording layer of trapezoidal shape, the angle of top can be sagging a little.

That is, form, magnetic head is moved successively by track width direction, measure the reproduction output V of magnetic head than writing fully little minisize track of track width _OutBy the track profile, with V _OutMaximal value (V _{Out MAX}) 1/2 output valve (V _{Out MAX}/ 2) width (so-called half value is wide) is defined as " reading width W r ".The constitutional diagram of the definition of " reading width W r " is shown at Figure 84.

In 3 couple (3 groups) burst region pattern of burst of the present invention portion, each is identical respectively to (each group) burst region pattern pitch Bp, and each of regulation burst region pattern pitch Bp disposes (each group) center line (1/3) Bp ground that staggers successively.In addition, for the data-track pitch Tp of data message recording portion, burst region pattern pitch Bp is defined as various values.Occasion of the present invention divides Bp=Tp, Bp=(3/4) Tp, Bp=(3/2) Tp and four kinds of occasions of Bp=3Tp to study.

Main points of the present invention are: under these four kinds of situations, each burst region pattern form is made the shape (quadrangular pyramid is trapezoidal) that on track width direction and track circumference direction, has the trapezoidal shape of essence respectively, when top corresponding in the trapezoidal shape of establishing track width direction with convex magnetic recording layer surface be W1, with the corresponding bottom in convex magnetic recording layer bottom surface be the data-track pitch of W2, above-mentioned data message recording portion when being reading width and being Wr of Tp, magnetic head, can satisfy predetermined relationship ground setting media structure.

(I) experimental example 2-1

Occasion as M=3, n=3

As Figure 29 or shown in Figure 34, when the logarithm of representing the burst region pattern with M (group number), M=3 is the occasion of the n=3 the when relational expression of burst region pattern pitch Bp and data-track pitch Tp is represented Bp=(3/n) Tp.In other words, be in possessing 3 burst portions to (3 groups) burst region pattern, the occasion of burst region pattern pitch Bp and data-track pitch Tp identical (Bp=Tp).

In this example, it is right that first burst region (VTR1) 94a and second burst region (VTR2) 94b are configured to, and the position with the distance (1Tp) of 1 track pitch that staggers is the magnetic recording layer that center line forms protuberance on track width direction each other.

It is right that the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance (1Tp) of 1 track pitch that staggers each other, to be configured to the stagger position of distance ((1/3) Tp) of (1/3) track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d simultaneously.

It is right that the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance (1Tp) of 1 track pitch that staggers each other, to be configured to the stagger position of distance ((2/3) Tp) of (2/3) track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f simultaneously.

(structure of magnetic recording medium)

As shown in figure 28, cut apart card, be the servo mode of applicable sector, form servo area 90 as shown in figure 29 with the sector.That is,, form ISG portion 91, SVAM portion 92, Gray code portion 93, burst portion 94 and filling part 95 according to the pattern of each servosignal.

The magnetic recording layer (convex magnetic recording layer) of the protuberance of the burst portion 94 of record burst makes the perpendicular magnetic recording layer of trapezoidal shape shown in figure 32.The top corresponding with convex magnetic recording layer surface is of a size of W1, and the bottom corresponding with convex magnetic recording layer bottom surface is of a size of W2, is that W2 is that the height of W1 is h to the top by bottom, in addition, and W2＞W1.

The cross sectional shape of medium as shown in figure 30, on the glass substrate 15 of mirror ultrafinish, form the PtMn layer of 15nm thickness, as oriented layer 14 (bedding course 14), form the soft ferromagnetic layer 11 of the 200nm thickness that constitutes by CoZrNb on it, and then form the middle layer 12 of the 8nm thickness that constitutes by nonmagnetic alloy CoTi thereon.After then forming the perpendicular magnetic recording layer 10 of 15nm thickness thereon, carry out the etch processes of predetermined pattern for making predetermined concavo-convex shape.Be the recess sputter SiO after the filling etching then ₂Then, on one side rotation fill SiO ₂Medium, handle Yi Bian carry out the oblique ion beam etching, remove the unnecessary SiO that forms on the perpendicular magnetic recording layer 10 ₂, with the media surface planarization.Form the diaphragm 13 of the carbon film of 1nm thickness thereon with the CVD method, apply the lubricant (Fomblin class) of 1nm thickness in addition, finish the medium sample.Also have, perpendicular magnetic recording layer 10 adopts SiO ₂In the rectangular material that comprises the ferromagnetism particle of CoPt.

The top W1 of the perpendicular magnetic recording layer of the trapezoidal shape suitable and the length of following W2 with burst region pattern shown in Figure 32, etching condition when changing the concaveconvex structure shaping, and be benchmark with the value of the track pitch Tp of data-track, increase or reduce the experiment segmentation that size forms various forms shown in the following table 2-1 by this benchmark.If the trapezoidal inclined-plane of trapezoidal shape and bottom surface angulation are 50 ° in whole experimental examples.That is, make the shape that satisfies tan50 °=2h/ (W2-W1).

Experiment makes above-mentioned M=3, the form of n=3 (Figure 34) with the form of segmentation.Pattern for data-track (DTR) 80, dispose first burst region track (VTR1) 94a, second burst region track (VTR2) 94b, the 3rd burst region track (VTR3) 94c, the 4th burst region track (VTR4) 94d, the 5th burst region track (VTR5) 94e, the 6th burst region track (VTR6) 94f, differential signal by will outputing to head position from VTR1 and VTR2, from the differential signal of VTR3 and VTR4 and synthetic from the differential signal of VTR5 and VTR6, generate accurate PES signal.

Record adopts magnetic to write the film inductive head of width 80nm with magnetic head.Reproduction is adopted giant magnetoresistance effect (GMR) head with magnetic head.Also have, reproduce with the magnetic of magnetic head and read width W r shown in table 2-1, adopt various width according to relation with other parameter (W1, W2, Tp).

Through the perpendicular magnetic recording medium of concavo-convex processing, carry out the perpendicular magnetic recording layer of protuberance is magnetized and the processing in generation servosignal magnetic field as above-mentioned predetermined servo area and data area.That is, between the magnetic pole of the electromagnet that produces D.C. magnetic field 15kOe, card and pole surface are set abreast after, make that the perpendicular magnetic recording layer of trapezoidal shape of servo area and data area is unified is with magnetic, thus with recorded servo signal.

Like this, the magnetic recording medium that the experimental example 2-1 that utilization has been prepared uses carries out the experiment of tracking Control by following main points.

Promptly, at discrete track dish shown in the following table 2-1, read with in the magnetic head, with track pitch Tp is benchmark, obtain whole position error signal PES of combination of each element size relation of W1, W2, Wr, consider the degree of admission of the linearity of PES in adjacent orbital position change as tracking characteristics, and spendable judgement could be shown in the table with " service rating " whether.

The relation of W1, W2, Tp and the Tr that implements in the respective figure among the table 2-1 illustrates in pattern accompanying drawing mode, therefore please refer to corresponding accompanying drawing.The PES signal is also simultaneously shown in the drawings.

Table 2-1 (M=3; N=3)

(1) condition of table 2-1 illustrated embodiment 2-I-1 is under the condition of Tp＞W2, and investigation changes when magnetic read concerning of the burst region pattern of width W r and W1, W2 and track pitch Tp position error signal PES and how to change and obtain.Each routine corresponding diagram is respectively Figure 38～Figure 43.

By Figure 38～Figure 43 as can be known, in the scope of " occasion of Tp＞W2,2W2＞Wr 〉=0.5W2 and 0.5W2＜W1 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

Also have, as can be known under the condition of " Tp＞W2 and Wr=0.5W2 ", what is called does not have linear completely geometrically by these figure, but owing to there is the isolation strip of discrete track, becomes to can be used as the grade of allowing that PES is used.

Also have, Figure 84 illustrate Figure 38 along A-A arrow cross section mode chart.The prosign that is marked on Figure 38 and Figure 30 is represented same member.

(2) in addition, 2-I-2 is under the condition of W2=Tp for table 2-1 illustrated embodiment, and investigation changes how position error signal PES changed when magnetic read concerning of the burst region pattern of width W r and W1, W2.Each routine corresponding diagram is respectively Figure 44～Figure 48.

By Figure 44～Figure 48 as can be known, in the scope of " occasion of Tp=W2,2W2-W1 〉=Wr 〉=0.444W2 and 0.444W2＜W1 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

(3) in addition, 2-I-3 is under the condition of W1=Tp for table 2-1 illustrated embodiment, and investigation changes how position error signal PES changed when magnetic read concerning of the burst region pattern of width W r and W1, W2.Each routine corresponding diagram is respectively Figure 49～Figure 54.

By Figure 49～Figure 54 as can be known, in the scope of " occasion of Tp=W1,1.5W1 〉=Wr 〉=0.444W1 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

(4) in addition, 2-I-4 is under the condition of W1＞Tp for table 2-1 illustrated embodiment, and investigation changes how position error signal PES changed when magnetic read concerning of the burst region pattern of width W r and W1, W2 and Tp.Each routine corresponding diagram is respectively Figure 55～Figure 60.

By Figure 55～Figure 60 as can be known, in the scope of " occasion of Tp＜W1,1.5W1 〉=Wr 〉=0.333W2 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

Also have, in embodiment 2-I-4, under the condition of W1＞Tp, can not get the PES signal during Wr=1.5W2.Thereby present embodiment is not carried out the demonstration based on accompanying drawing.

(II) experimental example 2-2

Occasion as M=3, n=4

As shown in figure 35, when the logarithm of representing the burst region pattern with M (group number), M=3 is shown, and the occasion of n=4 when the relational expression between burst region pattern pitch Bp and the data-track pitch Tp is expressed as Bp=(3/n) Tp.That is, in possessing 3 burst portions to (3 groups) burst region pattern, burst region pattern pitch Bp is 3/4 times the occasion (Bp=(3/4) Tp) of data-track pitch Tp.

In this example, as shown in figure 35, it is right that first burst region (VTR1) 94a and second burst region (VTR2) 94b are configured to, and the position with the distance ((3/4) Tp) of (3/4) track pitch that staggers is the magnetic recording layer that center line forms protuberance on track width direction each other.

In addition, it is right that the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance ((3/4) Tp) of (3/4) track pitch that staggers each other, to be configured to the stagger position of distance ((1/4) Tp) of (1/4) track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d simultaneously.

It is right that the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance ((3/4) Tp) of (3/4) track pitch that staggers each other, to be configured to the stagger position of distance ((1/2) Tp) of (1/2) track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f simultaneously.

(structure of magnetic recording medium)

The burst portion structure (M=3, n=3) of the magnetic recording medium among the above-mentioned experimental example 2-1 is changed over the structure (Figure 35) of above-mentioned M=3, n=4 occasion.In addition, according to the same main points of above-mentioned experimental example 2-1, made the magnetic recording medium that uses among the experimental example 2-2.The magnetic recording medium that utilization is used in this experimental example 2-1 carries out the experiment of tracking Control by above-mentioned experimental example 1.

Promptly, at discrete track dish shown in the following table 2-2, read with in the magnetic head, with track pitch Tp is benchmark, obtain whole position error signal PES of combination of each element size relation of W1, W2, Wr, as tracking characteristics with the linearity of PES spendable judgement could be shown in the table whether with " service rating ".

In addition, the relation of W1, W2, Tp and the Tr that implements in the respective figure among the table 2-2 illustrates in pattern accompanying drawing mode, therefore please refer to corresponding accompanying drawing.In addition, the PES signal is also simultaneously shown in the drawings.

Table 2-2 (M=3; N=4)

(1) condition of table 2-2 illustrated embodiment 2-II-1 is under the condition of Tp＞W2, and investigation changes when magnetic read concerning of the burst region pattern of width W r and W1, W2 and track pitch Tp position error signal PES and how to change and obtain.Each routine corresponding diagram is respectively Figure 61～Figure 68.

By Figure 61～Figure 68 as can be known,, obtain the linearity of site error detecting signal in the scope of " occasion of Tp＞W2,1.5W2 〉=Wr 〉=0.5W1 ", can, as position error signal, be operable grade.

As shown in figure 35, the structure when M=3, n=4 can be considered the occasion of above-mentioned Tp＞W2.

(III) experimental example 2-3

Occasion as M=3, n=2

As shown in figure 36, when the logarithm of representing the burst region pattern with M (group number), M=3 is shown, and the occasion of n=2 when the relational expression between burst region pattern pitch Bp and the data-track pitch Tp is expressed as Bp=(3/n) Tp.In other words, in possessing 3 burst portions to (3 groups) burst region pattern, burst region pattern pitch Bp is 3/2 times the occasion (Bp=(3/2) Tp) of data-track pitch Tp.

In this example, as shown in figure 36, it is right that first burst region (VTR1) 94a and second burst region (VTR2) 94b are configured to, and the position with the distance ((3/2) Tp) of (3/2) track pitch that staggers is the magnetic recording layer that center line forms protuberance on track width direction each other.

In addition, it is right that the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance ((3/2) Tp) of (3/2) track pitch that staggers each other, to be configured to the stagger position of distance ((1/2) Tp) of (1/2) track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d simultaneously.

It is right that the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance ((3/2) Tp) of (3/2) track pitch that staggers each other, to be configured to the stagger position of distance (1Tp) of 1 track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f simultaneously.

(structure of magnetic recording medium)

The burst portion structure (M=3, n=3) of the magnetic recording medium among the above-mentioned experimental example 2-1 is changed over the structure (Figure 36) of above-mentioned M=3, n=2 occasion.In addition, according to the same main points of above-mentioned experimental example 2-1, made the magnetic recording medium that uses among the experimental example 2-3.The magnetic recording medium that utilization is used in this experimental example 2-3 carries out the experiment of tracking Control according to above-mentioned experimental example 2-1.

Promptly, at discrete track dish shown in the following table 2-3, read with in the magnetic head, with track pitch Tp is benchmark, obtain whole position error signal PES of combination of each element size relation of W1, W2, Wr, as tracking characteristics with the linearity of PES spendable judgement could be shown in the table whether with " service rating ".

In addition, the relation of W1, W2, Tp and the Tr that implements in the respective figure among the table 2-3 illustrates in pattern accompanying drawing mode, therefore please refer to corresponding accompanying drawing.In addition, the PES signal is also simultaneously shown in the drawings.

Table 2-3 (M=3; N=2)

(1) condition of table 2-3 illustrated embodiment 2-III-1 is under the condition of W1＞Tp, and investigation changes when magnetic read concerning of the burst region pattern of width W r and W1, W2 and track pitch Tp position error signal PES and how to change and obtain.Each routine corresponding diagram is respectively Figure 67～Figure 72.

By Figure 67～Figure 72 as can be known, in the scope of " occasion of W1＞Tp, 1.5W2＞Wr 〉=0.333W2 and 0.333W2＜W1 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

As shown in figure 36, the structure when M=3, n=2 can be considered the occasion of above-mentioned W1＞Tp.

(IV) experimental example 2-4

Occasion as M=3, n=1

As shown in figure 37, when the logarithm of representing the burst region pattern with M (group number), M=3 is shown, and the occasion of n=1 when the relational expression between burst region pattern pitch Bp and the data-track pitch Tp is expressed as Bp=(3/n) Tp.In other words, in possessing 3 burst portions to (3 groups) burst region pattern, burst region pattern pitch Bp is 3 times the occasion (Bp=3Tp) of data-track pitch Tp.

In this example, as shown in figure 37, it is right that first burst region (VTR1) 94a and second burst region (VTR2) 94b are configured to, and the position with the distance (3Tp) of 3 track pitch that stagger is the magnetic recording layer that center line forms protuberance on track width direction each other.

In addition, it is right that the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance (3Tp) of 3 track pitch that stagger each other, to be configured to the stagger position of distance (1Tp) of 1 track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for these the 3rd burst region (VTR3) 94c and the 4th burst region (VTR4) 94d simultaneously.

It is right that the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f are configured to, be the magnetic recording layer that center line forms protuberance at track width direction with the position of the distance (3Tp) of 3 track pitch that stagger each other, to be configured to the stagger position of distance (2Tp) of 2 track pitch of the center line from described first burst region (VTR1) 94a and second burst region (VTR2) 94b be the magnetic recording layer that center line forms protuberance for the 5th burst region (VTR5) 94e and the 6th burst region (VTR6) 94f simultaneously.

(structure of magnetic recording medium)

The burst portion structure (M=3, n=3) of the magnetic recording medium among the above-mentioned experimental example 2-1 is changed to the structure (Figure 37) of above-mentioned M=3, n=1 occasion.In addition, according to the same main points of above-mentioned experimental example 2-1, made the magnetic recording medium that uses among the experimental example 2-4.The magnetic recording medium that utilization is used in this experimental example 2-4 carries out the experiment of tracking Control according to above-mentioned experimental example 2-1.

Promptly, at discrete track dish shown in the following table 2-4, read with in the magnetic head, with track pitch Tp is benchmark, obtain whole position error signal PES of combination of each element size relation of W1, W2, Wr, as tracking characteristics with the linearity of PES spendable judgement could be shown in the table whether with " service rating ".

In addition, the relation of W1, W2, Tp and the Tr that implements in the respective figure among the table 2-4 illustrates in pattern accompanying drawing mode, therefore please refer to corresponding accompanying drawing.In addition, the PES signal is also simultaneously shown in the drawings.Also have, on the actual segment track, arranged a plurality of patterns, but in mode chart for easy understanding, 1 burst region pattern is shown respectively.

Table 2-4 (M=3; N=1)

(1) condition of table 2-4 illustrated embodiment 2-IV-1 is under the condition of W1＞Tp, and investigation changes when magnetic read concerning of the burst region pattern of width W r and W1, W2 and track pitch Tp position error signal PES and how to change and obtain.Each routine corresponding diagram is respectively Figure 73～Figure 77.

By Figure 73～Figure 77 as can be known, in the scope of " occasion of W1＞Tp, 1.5W2＞Wr 〉=0.444W2 ", obtaining the linearity of site error detecting signal, as position error signal, is operable grade.

As shown in figure 37, the structure when M=3, n=1 can be considered the occasion of above-mentioned W1＞Tp.

(V) experimental example 2-5

Carry out experiment to the angle interdependence on the inclined-plane of trapezoidal shape.That is, under the situation of the lower limit condition Wr=0.444W1 (Figure 50) of the embodiment 2-I-3 in above-mentioned table 2-1, the angle interdependence on the inclined-plane of investigation trapezoidal shape pattern.The important document of the Wr=0.444W1 of embodiment 2-I-3 (Figure 50) is strict condition for obtaining linearity.

Result in the angle interdependence on the trapezoidal inclined-plane of the trapezoidal pattern of investigation shown in the following table 2-5.The accompanying drawing of PES when Figure 78～Figure 82 illustrates angle θ with the inclined-plane of trapezoidal pattern and is set at 21 °, 31 °, 38.7 °, 50 °, 85 °.Among the table 2-5,, but the occasion of service rating is marked " zero " based on the viewpoint of linearity, and the mark " * " that is difficult to use linearly.

Table 2-5

Bevel angle	21°	31°	38.7°	50°	85°
Bevel angle	21°	31°	38.7°	50°	85°	Service rating	Not (*)	Not (*)	Not (*)	Can (zero)	Can (zero)
Respective figure	Figure 78	Figure 79	Figure 80	Figure 81	Figure 82	Service rating	Not (*)	Not (*)	Not (*)	Can (zero)	Can (zero)

Based on the result of table 2-5, the occasion of condition strictness in the pattern of trapezoidal shape, especially the angle of the inclined-plane of the trapezium structure on the track width direction and bottom surface preferably has the angle more than 50 ° at least.Maximum bevel angle is preferably in below 85 °.

Also have, in the magnetospheric form of the such residual part of Figure 31, stay thin residual magnetism layer and hardly magnetic characteristic is exerted an influence, therefore can think that the bottom corresponding with the bottom surface of the convex magnetic recording layer of ignoring nubbin is W2, use the present invention.

Even increase a pair of burst region pattern again, make totally 4 pairs burst region pattern (M=4), also can enlarge and can obtain the usage range of position error signal accurately.But at this moment, with needs more complicated manufacturing process and control compare, the expansion effect of its practical scope becomes state of saturation, 3 pairs of burst region patterns (M=3) are compared for the present patent application of object together, advantage is few.

Also have, above-mentioned experimental example is the condition of adhering to guaranteeing the linearity of position error signal, and in actual device, additional read head width W r (magnetic is read width W r) can not directly reproduce the condition of adjacent data tracks.

That is, be W when establishing the data-track width, when track pitch is Tp, need the condition of Wr＜2Tp-W.In other words, shown in Figure 85, be that magnetic is read the condition that width W r does not cross over adjacent 2 data tracks.

Magnetic recording system of the present invention especially is installed to computing machine and is used, and can utilize in information writes down with the device industry.

Claims

1. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

Described data message recording portion possesses the data-track of data-track pitch Tp,

Describedly servoly constitute by the magnetic recording layer that forms by predetermined relief pattern with information portion,

Described servoly possess the burst portion that the burst of usefulness followed the tracks of in record with information portion,

Described burst portion comprises first burst region, second burst region, the 3rd burst region and the 4th burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes,

It is right that described first burst region and second burst region are configured to, and the position of staggering apart from 2Tp with 2 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other,

It is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering apart from 2Tp with 2 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, on the described center line of the 3rd burst region and the 4th burst region is configured in respectively and staggers the position apart from 1Tp of 1 track pitch from the center line of described first burst region and second burst region simultaneously, to form the magnetic recording layer of protuberance

The magnetic recording layer of described protuberance has trapezoidal shape respectively on track width direction and track circumference direction,

On the trapezoidal shape of described track width direction, establish with the surperficial corresponding top of convex magnetic recording layer be W1, with the corresponding bottom in the bottom surface of convex magnetic recording layer be that the bottom of W2, described convex magnetic recording layer is the height of W2 till the top is W1 when being h,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

W1＞Tp wherein, and satisfy the condition of 1.25W2＞Wr 〉=0.5W2.

2. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

It is right that described first burst region and second burst region are configured to, each other on track width direction with The distance of track pitch

The position of staggering is the magnetic recording layer that center line forms protuberance,

It is right that described the 3rd burst region and the 4th burst region are configured to, each other on track width direction with

The distance of track pitch

The position of staggering is the magnetic recording layer that center line forms protuberance, and the described center line of the 3rd burst region and the 4th burst region is configured in respectively from the center line of described first burst region and second burst region and staggers simultaneously

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

Tp＞W2 wherein, and satisfy the condition of 1.5W2 〉=Wr 〉=0.5W1.

3. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

Described burst portion comprises first burst region, second burst region, the 3rd burst region, the 4th burst region, the 5th burst region and the 6th burst region that the magnetic recording layer by a plurality of protuberances that write down burst constitutes,

It is right that described first burst region and second burst region are configured to, and the position of staggering apart from 1Tp with 1 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other,

It is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering apart from 1Tp with 1 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, and the described centreline configuration of the 3rd burst region and the 4th burst region staggers at the center line from described first burst region and second burst region simultaneously The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

It is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering apart from 1Tp with 1 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, and the described center line of the 5th burst region and the 6th burst region is configured in respectively from the center line of described first burst region and second burst region and staggers respectively simultaneously

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

Tp＞W2 wherein, and satisfy the condition of 2W2＞Wr 〉=0.5W2 and 0.5W2＜W1.

4. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

It is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering apart from 1Tp with 1 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, and the described center line of the 3rd burst region and the 4th burst region is configured in respectively from the center line of described first burst region and second burst region and staggers simultaneously The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

The distance of track pitch The position on, forming the magnetic recording layer of protuberance,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

Tp=W2 wherein, and satisfy the condition of 2W2-W1 〉=Wr 〉=0.444W2 and 0.444W2＜W1.

5. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

It is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering apart from 1Tp with 1 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, and the described center line of the 3rd burst region and the 4th burst region is configured in respectively from the center line of described first burst region and second burst region and staggers simultaneously

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

Tp=W1 wherein, and satisfy the condition of 1.5W1 〉=Wr 〉=0.444W1.

6. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

Tp＜W1 wherein, and satisfy the condition of 1.5W1 〉=Wr 〉=0.333W2.

7. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

It is right that described first burst region and second burst region are configured to, each other on track width direction with

The distance of track pitch The position of staggering is the magnetic recording layer that center line forms protuberance,

The distance of track pitch

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

It is right that described the 5th burst region and the 6th burst region are configured to, each other on track width direction with

The distance of track pitch

The position of staggering is the magnetic recording layer that center line forms protuberance, and the described center line of the 5th burst region and the 6th burst region is configured in respectively from the center line of described first burst region and second burst region and staggers respectively simultaneously The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

Tp＞W2 wherein, and satisfy the condition of 1.5W2 〉=Wr 〉=0.5W1.

8. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

The distance of track pitch

The distance of track pitch

The distance of track pitch

The position on, forming the magnetic recording layer of protuberance,

The distance of track pitch

The position of staggering is the magnetic recording layer that center line forms protuberance, on the described center line of the 5th burst region and the 6th burst region is configured in respectively and staggers the position apart from 1Tp of 1 track pitch respectively from the center line of described first burst region and second burst region simultaneously, to form the magnetic recording layer of protuberance

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

W1＞Tp wherein, and satisfy the condition of 1.5W2＞Wr 〉=0.333W2 and 0.333W2＜W1.

9. a magnet record playback device is provided with: comprise the data message recording portion and follow the tracks of the servo magnetic recording medium with information portion of usefulness; When detecting the servo-information of described servo usefulness information portion, data message is recorded the magnetic head that described data message recording portion is also reproduced, wherein,

It is right that described first burst region and second burst region are configured to, and the position of staggering apart from 3Tp with 3 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other,

It is right that described the 3rd burst region and the 4th burst region are configured to, the position of staggering apart from 3Tp with 3 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, on the described center line of the 3rd burst region and the 4th burst region is configured in respectively and staggers the position apart from 1Tp of 1 track pitch from the center line of described first burst region and second burst region simultaneously, to form the magnetic recording layer of protuberance

It is right that described the 5th burst region and the 6th burst region are configured to, the position of staggering apart from 3Tp with 3 track pitch is the magnetic recording layer that center line forms protuberance on track width direction each other, on the described center line of the 5th burst region and the 6th burst region is configured in respectively and staggers the position apart from 2Tp of 2 track pitch respectively from the center line of described first burst region and second burst region simultaneously, to form the magnetic recording layer of protuberance

Satisfy tan85 ° 〉=2h/ (W2-W1) 〉=tan50 ° condition,

To read width be Wr if the data-track width is W, magnetic head,

Satisfy the condition of Wr＜2Tp-W,

W1＞Tp wherein, and satisfy the condition of 1.5W2＞Wr 〉=0.444W2.