WO1998054707A1 - Near field magneto-optical recording system employing slit illumination - Google Patents
Near field magneto-optical recording system employing slit illumination Download PDFInfo
- Publication number
- WO1998054707A1 WO1998054707A1 PCT/US1998/009759 US9809759W WO9854707A1 WO 1998054707 A1 WO1998054707 A1 WO 1998054707A1 US 9809759 W US9809759 W US 9809759W WO 9854707 A1 WO9854707 A1 WO 9854707A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical recording
- solid immersion
- recording medium
- immersion lens
- reproducing system
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1387—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector using the near-field effect
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10541—Heads for reproducing
- G11B11/10543—Heads for reproducing using optical beam of radiation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
- G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/1058—Flying heads
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing
Definitions
- This invention relates generally to an optical recording system and more particularly to an optical recording system employing a solid immersion lens with slit illumination.
- the size of the regions or domains determines the density of the digital information.
- the size of the localized regions is limited by diffraction of the light energy and is marginally improved by use of shorter wavelengths of light and higher numerical aperture lens.
- microscopy the diffraction limitation is overcome by employing near-field microscopy.
- near-field microscopy the light beam is focused through a pinhole that is smaller than the diffraction limited spot size of the light beam. The pinhole is placed very close to the object.
- the size of the pinhole determines the definition of the microscope.
- Betzig and others overcame the diffraction limitation in an optical recording system by employing near-field optics. They demonstrated areas of 20 nm diameter or better for the magnetized regions or domains. (E. Betzig, J. K.
- an optical recording system including a read/write optical assembly for reading or writing from a magneto-optical medium.
- a solid immersion lens is interposed between the objective lens of the read/write head and the magnetic recording medium. The use of the solid immersion lens in conjunction with the objective lens decreases the spot size of the light focused on the recording medium and therefore increases the optical density and resolution. The spot size is diffraction limited.
- an optical read/write head of the type which includes an objective lens and a solid immersion lens interposed between the optical recording medium and the objective lens.
- the solid immersion lens is provided with a metal film or mask which includes an opening which defines the size of the magnetized regions or domains.
- FIGURE 1 is a schematic diagram of an optical recording system employing a masked solid immersion lens in accordance with the present invention.
- FIGURE 2 is the schematic diagram of an optical reading system employing a masked solid immersion lens in accordance with the present invention.
- FIGURE 3 is an enlarged perspective view of a masked solid immersion lens with a pinhole opening used in the present invention.
- FIGURE 4 is an enlarged perspective view of a masked solid immersion lens with a slit opening used in the present invention.
- FIGURE 5 is an enlarged perspective view of a masked solid immersion lens used in the present invention having an opening defined by crossed slits.
- FIGURE 6 is an enlarged perspective view of another masked crossed slit solid immersion lens used in the present invention.
- a magneto-optic recording system employing a masked solid immersion lens in accordance with the invention is schematically illustrated in Figures 1 and 2.
- Data is recorded on and read from a magneto-optic disk 21.
- the disk may for example have a magneto-optical film deposited on its front surface with a silicon nitride layer typically in the order of 50 nm thick laid down on top of the magnetic layer for protection and for optimizing the field distribution.
- the magneto-optic film may have a silicon nitride backing on aluminum and have a thin film of silicon nitride deposited on its front surface for protection.
- a good example of a suitable magneto-optic material would be
- the optical head includes an objective lens 22 which focuses the light 23 into the floating solid immersion lens 24.
- the solid immersion lens provides a higher numerical
- the position on the disk of the objective lens and solid immersion lens are maintained by a servosystem (not shown).
- the solid immersion lens is maintained at a height of approximately 50nm above the optical disk.
- the solid immersion lens is maintained spaced from the disk by an air bearing (a floating solid immersion lens).
- a metal film 26 is deposited on the flat surface of the solid immersion lens.
- the film is then etched to form an opening which defines the size and shape of the light spot striking the recording medium.
- the metal film is as thin as possible while being opaque to mask the light.
- the size of the opening determines the optical recording/reproducing density and resolution of the read/write system.
- the opening may be defined for instance by standard electron beam lithographic methods or by use of a tunneling microscope lithographic technique. Such techniques permit the formation of very small openings to thereby increase the resolution of the read/write optical system of the present invention.
- the solid opaque mask or metal film 26 is provided with a pinhole 27 which defines the spot size and the size of the recorded magnetic domain.
- the metal film is provided with a slit 28 oriented across the tracks whereby the width of the slit defines the size of the magnetic domain along a track. A portion of the slit may be illuminated to write/read while a portion may be illuminated to position the read/write head with respect to the recording medium. It is apparent that in the embodiments of Figures 3 and 4 the intensity of the light must not raise the temperature of the recording medium above the Curie temperature when the recorded data is read or the recorded data would be erased.
- the preferred embodiment of the mask is shown in Figure 5. It includes crossed slits 31 and 32.
- the slits will be in the order of 0.05-0.2 ⁇ m wide, but their width may be smaller or larger than these values depending upon the desired recording density.
- the length of the slits is at least one-half wavelength of the light for the slit material with an effective refractive index n, where n is a refractive index slightly less than that of the lens material.
- n is a refractive index slightly less than that of the lens material.
- the length of the slits would have to be slightly more than 162 nm.
- the width could be 50 nm or less.
- the pinhole 27 or slit 28 are illuminated with light of sufficient intensity to raise the temperature of the magneto-optic material above the Curie temperature.
- the light intensity in each slit is such as to heat the media below the Curie temperature, except at the crossing where the combined intensity heats the media above the Curie temperature.
- the applied magnetic field will form well-defined magnetic domains.
- the crossover area may be a fraction of a wavelength in area.
- Data is recorded by modulating the laser as the disk rotates. Tracking is accomplished by detecting reflected light from the horizontal slit 32 in the same manner as will be described in the read mode of operation.
- the light energy at the recorded domains is of an intensity which does not raise the temperature of the medium above the Curie point.
- light from the laser 33 is polarized by polarizer 34, passes through the beam splitter, and is focused by the objective lens onto the masked solid immersion lens.
- the light is polarized so that the E fields in the horizonal slit 27 extending across the slit in the track direction.
- the reflected fields which are rotated by the Kerr or Faraday rotation are picked up and reflected by beam splitter 36 into the one-half wave plate 37 and through the polarizing beam splitter 38 and focused on detectors 1 and 2 by lens 41 and 42.
- Light reflected through the horizonal slit passes through the same optical elements and can be used for positioning of the heads with respect to the tracks as well as for reading the recorded data.
- the direct reflected signal through the horizontal slit is of amplitude A and the rotated component through the vertical slit is of amplitude B
- signals are provided to detectors 1 and 2.
- the value of the signals are A + B, (A + B) 2 and (A - B) 2 .
- the difference of these signals is proportional to 2AB and thus proportional to the amplitude of the rotated component. Since A 2 is very much greater than B 2 the sum of the two signals would be essentially A .
- One of the detectors can have two or more phototransducers and can be used for tracking and focusing.
- the flat surface of the solid immersion lens may be provided with a snout 38, figure 6, onto which a coil 39 can be wound to apply magnetic fields during recording.
- a snout is provided the metal film 26 is formed on the surface of the snout.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98921175A EP0985210A1 (en) | 1997-05-29 | 1998-05-12 | Near field magneto-optical recording system employing slit illumination |
AU73847/98A AU7384798A (en) | 1997-05-29 | 1998-05-12 | Near field magneto-optical recording system employing slit illumination |
JP11500715A JP2000513132A (en) | 1997-05-29 | 1998-05-12 | Near-field magneto-optical recording system employing slit illumination |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/865,221 | 1997-05-29 | ||
US08/865,221 US5883872A (en) | 1997-05-29 | 1997-05-29 | Near field magneto-optical recording system employing slit illumination |
Publications (1)
Publication Number | Publication Date |
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WO1998054707A1 true WO1998054707A1 (en) | 1998-12-03 |
Family
ID=25344981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/009759 WO1998054707A1 (en) | 1997-05-29 | 1998-05-12 | Near field magneto-optical recording system employing slit illumination |
Country Status (6)
Country | Link |
---|---|
US (1) | US5883872A (en) |
EP (1) | EP0985210A1 (en) |
JP (1) | JP2000513132A (en) |
AU (1) | AU7384798A (en) |
TW (1) | TW376503B (en) |
WO (1) | WO1998054707A1 (en) |
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- 1998-05-12 JP JP11500715A patent/JP2000513132A/en active Pending
- 1998-05-12 EP EP98921175A patent/EP0985210A1/en not_active Withdrawn
- 1998-05-12 WO PCT/US1998/009759 patent/WO1998054707A1/en not_active Application Discontinuation
- 1998-05-25 TW TW087108085A patent/TW376503B/en active
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0919993A2 (en) * | 1997-11-25 | 1999-06-02 | Hitachi, Ltd. | Method and apparatus for optically recording and reproducing information |
EP0919993A3 (en) * | 1997-11-25 | 1999-12-01 | Hitachi, Ltd. | Method and apparatus for optically recording and reproducing information |
US6298029B1 (en) | 1997-11-25 | 2001-10-02 | Hitachi, Ltd. | Information recording and reproducing apparatus and methods of recording and reproducing information using solid immersion lens having super resolution film deposited thereon |
EP0944049A3 (en) * | 1998-03-19 | 2000-03-08 | Fuji Xerox Co., Ltd. | Optical head, disk apparatus, method for manufacturing optical head and optical element |
US6154326A (en) * | 1998-03-19 | 2000-11-28 | Fuji Xerox Co., Ltd. | Optical head, disk apparatus, method for manufacturing optical head, and optical element |
US6320708B1 (en) | 1998-03-19 | 2001-11-20 | Fuji Xerox Co., Ltd. | Optical head, disk apparatus, method for manufacturing optical head, and optical element |
US7489617B2 (en) | 1998-11-27 | 2009-02-10 | Minolta Co., Ltd. | Optical head and optical head device |
NL1013806C2 (en) * | 1998-12-09 | 2007-03-06 | Sony Corp | Optical head, and optical recording and / or reproducing device. |
WO2000072076A1 (en) * | 1999-05-21 | 2000-11-30 | Brugger Juergen | Probe tip that is transparent to light and method for producing the same |
Also Published As
Publication number | Publication date |
---|---|
AU7384798A (en) | 1998-12-30 |
US5883872A (en) | 1999-03-16 |
JP2000513132A (en) | 2000-10-03 |
TW376503B (en) | 1999-12-11 |
EP0985210A1 (en) | 2000-03-15 |
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