CN1306510C - Thermo-writing and magnetic-reading record medium having high-density and system thereof - Google Patents
Thermo-writing and magnetic-reading record medium having high-density and system thereof Download PDFInfo
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- CN1306510C CN1306510C CNB2003101230021A CN200310123002A CN1306510C CN 1306510 C CN1306510 C CN 1306510C CN B2003101230021 A CNB2003101230021 A CN B2003101230021A CN 200310123002 A CN200310123002 A CN 200310123002A CN 1306510 C CN1306510 C CN 1306510C
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- recording layer
- write
- magnetic
- recording
- magnetic read
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Abstract
The present invention relates to a heat-writing and magnetic-reading recording medium having high density and a system thereof. Data can be written in by a near-field optical laser and can be read by a magnetoresistance head. The recording medium comprises a base plate, a recording layer arranged at one side of the base plate and a plurality of microcylindrical lenses arranged between the base plate and the recording layer. When the data is written in the recording layer by the near-field optical laser, a near-field optical effect can be generated to reduce the dimension of a light spot and improve the recording density of the recording layer. Additionaly, the data of the recording layer can be read by the magnetoresistance head. A heat-writing and magnetic-reading system having high density is formed by combining the near-field optical writing in technique and the sensitive reading technique of the magnetoresistance head to break through the limit of optical diffraction and improve the density of the recording medium. The microcylindrical lenses are directly arranged on the base plate of the recording medium to greatly reduce the dimension of the light spot when the date is written in by the near-field optical laser, and therefore, smaller recording position is obtained to improve the recording density of the recording medium.
Description
Technical field
The present invention relates to a kind of recording medium, be applied in the magnetooptic recording system, relate in particular to that a kind of combined with near field optics writes and the reading technology of magnetoresistive head sensitivity and the highdensity heat of tool is write magnetic read record medium and system thereof.
Background technology
In the middle of the field of recording medium, the recording density that how to promote recording medium is most important problem for a long time always.Recording medium can be divided into optical recording media and magnetic recording medium according to the difference that stores principle, and wherein optical recording media is subject to the restriction that optics diffraction limit magnetic recording medium then is subject to the super paramagnetic limit, makes that its recording density can't continue to improve.
In recent years, technology such as near field optic and optics super resolution have been applied to discs, to break through the diffraction limit of optical disc recording medium.With near field optic, (solidimmersion lens SIL) obtains the luminous point littler than the diffraction limit, and obtains littler recorded bit to improve the recording density of discs can to utilize a solid immersion lens.But the sliding flying distance between the object lens of its optical head and the disc must can produce near-field effect less than the laser light wavelength, so will increase the difficulty of CD-ROM system design.As No. the 6614742nd, United States Patent (USP), be with solid immersion lens (solid immersion lens, SIL) as near-field recording, but the SIL optical head must design complicated suspension system, and optical head and disc must be kept about 100nm distance, practical application degree of difficulty height.
In addition, people such as Guerra proposes a kind of integration near field optic (Integral Near-field Optical; INFO) technology, be solid immersion lens (solid immersion lens with time little cylindrical shape, SIL) directly be made on the substrate of traditional DVD discs, significantly dwindle the recording density of spot definition and then raising discs, and do not need the distance between optical read head and discs is shortened to below the Wavelength of Laser, so can solve in the near-field optical systems, optical read head and discs are too near to and the problem of collision friction during the discs rotation, and the recording density of DVD discs also can rise to 9.4GB by 4.7GB.(J.Guerra，D.Vezenov，P.Sullivan，W.Haimberger，and?L.Thulin，“Near-field?optical?recordingwithout?low-flying：integral?near-field?optical?media”，Jpn.J.Appl.Phys.Vol.41，pp.1866-1875，2002)。Yet, when this technology is applied to traditional magneto-optical disc, though recorded bit can significantly be dwindled, but when reading, magnetooptic recording is that the catoptrical kerr rotational angle of detecting (Kerr angle) is when coming reading signal, because of Kerr effect can weaken along with dwindling of area of detecting, when feasible magnetic domain when disc record is very little, when just recording density was very high, reflected light is just very weak, and cause can't reading signal, quite inconvenient in the application.
On the other hand on magnetic recording medium, in order to improve the recording density of magnetic recording medium, people such as Hideki proposed a kind of new heat in 1998 and write magnetic read record mode, this is can form the advantage of knowing vertical sector in conjunction with magneto-optical disc, and the high sensitivity large reluctance magnetic head of hard disk (giant magneto-resistive head, GMR head) advantage that reads technology is reached (H.Saga, H.Nemoto, H.Sukeda, and M.Takahashi, " New recording method combining thermo-magnetic writing and fluxdection ", Jpn.J.Appl.Phys.Vol.38, pp.1839-1840,1999).Its recording sheet is traditional magneto-optic memory technique, utilize the pyromagnetic wiring method record signal of traditional magneto-optic, then measure the magnetic flux reading signal when reading with large reluctance magnetic head, but traditional magneto-optic recording material, and be not suitable for heat and write the recording medium that magnetic is read, be that mainly saturated magnetization amount (Ms) value under its room temperature is too little, can't provide enough magnetic flux to supply the large reluctance magnetic head reading signal.
Summary of the invention
Technical matters to be solved by this invention is to provide the highdensity heat of a kind of tool to write magnetic read record medium and system thereof, not only alleviated read head suspension system (Slider) weight and simplified its design, and can significantly improve the recording density of disc.
To achieve these goals, the invention provides the highdensity heat of a kind of tool and write magnetic read record medium, its characteristics are, write data by near field optic laser and see through magnetoresistive head and read data, and described recording medium includes:
One substrate;
One recording layer is formed at a side of described substrate; And
A plurality of microcylindrical lens, be formed between described substrate and the described recording layer, make and to write data when the described recording layer by described near field optic laser, the size that can produce near field optical effects and dwindle its luminous point, improve the recording density of described recording layer, and can read the data of described recording layer by described magnetoresistive head;
Wherein, the surface of the vertical described recording layer of direction of magnetization of described recording layer; Described recording layer is a magnetooptic recording layer, also has a readout layer on the described magnetooptic recording layer.
The highdensity heat of above-mentioned tool is write magnetic read record medium, and its characteristics are that described substrate is a glass substrate.
The highdensity heat of above-mentioned tool is write magnetic read record medium, and its characteristics are that the effective numerical aperture of described microcylindrical lens is greater than 1.1.
The highdensity heat of above-mentioned tool is write magnetic read record medium, and its characteristics are that described microcylindrical lens is a solid immersion lens.
The highdensity heat of above-mentioned tool is write magnetic read record medium, and its characteristics are that the material of described microcylindrical lens is selected from by ZnS, SiO
2And SiN
XIn the combination that is constituted one.
The highdensity heat of above-mentioned tool is write magnetic read record medium, and its characteristics are that described recording layer is a magnetic recording thin film.
The highdensity heat of above-mentioned tool is write magnetic read record medium, and its characteristics are also have a readout layer on the described magnetic recording thin film.
The present invention also provides the highdensity heat of a kind of tool to write the magnetic read apparatus, and its characteristics are, include:
One recording medium comprises recording layer and a plurality of microcylindrical lens that is formed between described substrate and the described recording layer that a substrate, is formed at described substrate;
Wherein, the surface of the vertical described recording layer of direction of magnetization of described recording layer; Described recording layer is a magnetooptic recording layer, also has a readout layer on the described magnetooptic recording layer;
One near field optic laser is located at described recording medium one side, can write data for described recording layer, and produces near field optical effects and the size of dwindling its luminous point, improves the recording density of described recording layer; And
One magnetoresistive head is installed in the opposite side of described recording medium, in order to read the data of described recording layer.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are that described substrate is a glass substrate.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are that the effective numerical aperture of described microcylindrical lens is greater than 1.1.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are that described microcylindrical lens is a solid immersion lens.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are that the material of described microcylindrical lens is selected from by ZnS, SiO
2And SiN
XIn the combination that is constituted one.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are that described recording layer is a magnetic recording thin film.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are also have a readout layer on the described magnetic recording thin film.
The highdensity heat of above-mentioned tool is write the magnetic read apparatus, and its characteristics are that described magnetoresistive head is selected from large reluctance magnetic head or tunnel shape magnetoresistive head.
The highdensity heat of disclosed tool is write magnetic read record medium and system thereof according to the present invention, combined with near field optics (Integral Near-field Optical; INFO) write and the technology that reads that magnetoresistive head (Magneto-resistancehead) is sensitive, break through the limit of optics diffraction, improve the density of recording medium.Its system includes near field optic laser, magnetoresistive head and recording medium, and has little columned solid immersion lens on the recording medium, make that the near field optic laser-light write is fashionable, produce optical effect and its luminous point is dwindled, and on recording medium, obtain less record position and improve recording density, therefore, near field optic laser does not need can reach the effect that near field optic writes near recording medium, when avoiding the recording medium rotation, laser and recording medium are too near to and the problem of collision friction; And cooperate magnetoresistive head to read data, not only alleviated suspension system weight, and simplify the design of aircraft.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the structural representation of the first embodiment of the present invention;
Fig. 2 is the structural representation of the second embodiment of the present invention.
Embodiment
The highdensity heat of the disclosed tool of the present invention is write magnetic read record medium and system thereof, see also Fig. 1, include near field optic laser 30, recording medium 10 and magnetoresistive head 20, wherein, the recording layer 11 that recording medium 10 includes substrate 12 and is covered on substrate 12 1 sides, and also be formed with little cylinder lenses 13 between substrate 12 and the recording layer 11.And substrate 12 can be a glass substrate, and forms little columniform solid immersion lens (solid immersion lens thereon; SIL) be covered with whole recording layer 11 belows, the laser light 311 that makes the laser head 31 of near field optic laser 30 be launched can produce near field optical effects, and the spot definition that forms on recording layer 11 is dwindled, and then obtain less recorded bit to improve recording density, solve in the general near-field optical systems, optical head and recording medium too close and with the interface problem of recording medium surface friction.Its material can be ZnS (zinc sulphide), SiO
2(silicon dioxide) or SiN
X(silicon nitride), and require effective numerical aperture (effective numerical aperture) greater than 1.1.
On the other hand,, do not need the special aircraft of additional designs (slider) 21 promptly to can read, alleviate the weight of suspension system (not shown) by the data that magnetoresistive head 20 comes reading and recording layer 11.Magnetoresistive head 20 can be large reluctance magnetic head (giant magneto-resistive head; GMR head) or tunnel shape magnetoresistive head (Tunneling Magneto-resistance head; TMR head), be good still with tunnel shape magnetoresistive head.Recording layer 11 is magnetic recording thin film or magneto-optic recording material, at room temperature magnetic requires to need having high saturation amount (Ms) and high vertical face coercive force (Hc) at normal temperature, and vertical face coercive force (Hc) value can descend rapidly and is beneficial to pyromagnetic writing during the temperature rising.
When writing data, utilize laser head 31 to send laser 311 process focus lamps 32, pass substrate 12, be subjected to microcylindrical lens 13 and produce near field optical effects, make that recording layer 11 is magnetized, its direction of magnetization is good (as the direction of arrow that is illustrated among the figure) with vertical surface, so, can improve the density of record.And when reading, read by recording layer 11 1 sides by magnetoresistive head 20, can alleviate the weight of suspension system again and simplify the design of aircraft 21.
In addition, the second embodiment of the present invention, as shown in Figure 2, mainly be to consider that recording layer 11 exposes, therefore wearing and tearing or demagnetization easily also form readout layer 14 in the outside, the data of its main duplicated record layer 11 reads for magnetoresistive head 20, all the other working methods, principle are all identical, and the design that can improve recording density and alleviate suspension system does not repeat them here equally.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1, the highdensity heat of a kind of tool is write magnetic read record medium, it is characterized in that, writes data by near field optic laser and sees through magnetoresistive head and read data, and described recording medium includes:
One substrate;
One recording layer is formed at a side of described substrate; And
A plurality of microcylindrical lens, be formed between described substrate and the described recording layer, make and to write data when the described recording layer by described near field optic laser, the size that can produce near field optical effects and dwindle its luminous point, improve the recording density of described recording layer, and can read the data of described recording layer by described magnetoresistive head;
Wherein, the surface of the vertical described recording layer of direction of magnetization of described recording layer; Described recording layer is a magnetooptic recording layer, also has a readout layer on the described magnetooptic recording layer.
2, the highdensity heat of tool according to claim 1 is write magnetic read record medium, it is characterized in that, described substrate is a glass substrate.
3, the highdensity heat of tool according to claim 1 is write magnetic read record medium, it is characterized in that, the effective numerical aperture of described microcylindrical lens is greater than 1.1.
4, the highdensity heat of tool according to claim 3 is write magnetic read record medium, it is characterized in that, described microcylindrical lens is a solid immersion lens.
5, the highdensity heat of tool according to claim 4 is write magnetic read record medium, it is characterized in that, the material of described microcylindrical lens is selected from by ZnS, SiO
2And SiN
XIn the combination that is constituted one.
6, the highdensity heat of tool according to claim 1 is write magnetic read record medium, it is characterized in that, described recording layer is a magnetic recording thin film.
7, the highdensity heat of tool according to claim 6 is write magnetic read record medium, it is characterized in that, also has a readout layer on the described magnetic recording thin film.
8, the highdensity heat of a kind of tool is write the magnetic read apparatus, it is characterized in that, includes:
One recording medium comprises recording layer and a plurality of microcylindrical lens that is formed between described substrate and the described recording layer that a substrate, is formed at described substrate;
Wherein, the surface of the vertical described recording layer of direction of magnetization of described recording layer; Described recording layer is a magnetooptic recording layer, also has a readout layer on the described magnetooptic recording layer;
One near field optic laser is located at described recording medium one side, can write data for described recording layer, and produces near field optical effects and the size of dwindling its luminous point, improves the recording density of described recording layer; And
One magnetoresistive head is installed in the opposite side of described recording medium, in order to read the data of described recording layer.
9, the highdensity heat of tool according to claim 8 is write the magnetic read apparatus, it is characterized in that, described substrate is a glass substrate.
10, the highdensity heat of tool according to claim 8 is write the magnetic read apparatus, it is characterized in that, the effective numerical aperture of described microcylindrical lens is greater than 1.1.
11, the highdensity heat of tool according to claim 10 is write the magnetic read apparatus, it is characterized in that, described microcylindrical lens is a solid immersion lens.
12, the highdensity heat of tool according to claim 11 is write the magnetic read apparatus, it is characterized in that, the material of described microcylindrical lens is selected from by ZnS, SiO
2And SiN
XIn the combination that is constituted one.
13, the highdensity heat of tool according to claim 8 is write the magnetic read apparatus, it is characterized in that, described recording layer is a magnetic recording thin film.
14, the highdensity heat of tool according to claim 13 is write the magnetic read apparatus, it is characterized in that, also has a readout layer on the described magnetic recording thin film.
15, the highdensity heat of tool according to claim 8 is write the magnetic read apparatus, it is characterized in that, described magnetoresistive head is selected from large reluctance magnetic head or tunnel shape magnetoresistive head.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101230021A CN1306510C (en) | 2003-12-23 | 2003-12-23 | Thermo-writing and magnetic-reading record medium having high-density and system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101230021A CN1306510C (en) | 2003-12-23 | 2003-12-23 | Thermo-writing and magnetic-reading record medium having high-density and system thereof |
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| Publication Number | Publication Date |
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| CN1632872A CN1632872A (en) | 2005-06-29 |
| CN1306510C true CN1306510C (en) | 2007-03-21 |
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| CNB2003101230021A Expired - Fee Related CN1306510C (en) | 2003-12-23 | 2003-12-23 | Thermo-writing and magnetic-reading record medium having high-density and system thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5910940A (en) * | 1996-10-08 | 1999-06-08 | Polaroid Corporation | Storage medium having a layer of micro-optical lenses each lens generating an evanescent field |
| US20010040841A1 (en) * | 1999-12-15 | 2001-11-15 | Shieh Han-Ping David | Recording method and medium for optical near-field writing and magnetic flux reading |
| CN1377035A (en) * | 2001-03-22 | 2002-10-30 | 财团法人工业技术研究院 | Near-field optical disk |
| US6628574B1 (en) * | 1998-01-12 | 2003-09-30 | Hitachi Maxell, Ltd. | Reproducing method and reproducing apparatus using plural light beam powers for transferring a magnetic domain |
-
2003
- 2003-12-23 CN CNB2003101230021A patent/CN1306510C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5910940A (en) * | 1996-10-08 | 1999-06-08 | Polaroid Corporation | Storage medium having a layer of micro-optical lenses each lens generating an evanescent field |
| US6628574B1 (en) * | 1998-01-12 | 2003-09-30 | Hitachi Maxell, Ltd. | Reproducing method and reproducing apparatus using plural light beam powers for transferring a magnetic domain |
| US20010040841A1 (en) * | 1999-12-15 | 2001-11-15 | Shieh Han-Ping David | Recording method and medium for optical near-field writing and magnetic flux reading |
| CN1377035A (en) * | 2001-03-22 | 2002-10-30 | 财团法人工业技术研究院 | Near-field optical disk |
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| Publication number | Publication date |
|---|---|
| CN1632872A (en) | 2005-06-29 |
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