GB2077065B - Magnetooptic memory medium - Google Patents

Magnetooptic memory medium

Info

Publication number
GB2077065B
GB2077065B GB8105358A GB8105358A GB2077065B GB 2077065 B GB2077065 B GB 2077065B GB 8105358 A GB8105358 A GB 8105358A GB 8105358 A GB8105358 A GB 8105358A GB 2077065 B GB2077065 B GB 2077065B
Authority
GB
United Kingdom
Prior art keywords
memory medium
magnetooptic
magnetooptic memory
medium
memory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB8105358A
Other versions
GB2077065A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2191080A external-priority patent/JPS56119951A/en
Priority claimed from JP2598080A external-priority patent/JPS56119991A/en
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of GB2077065A publication Critical patent/GB2077065A/en
Application granted granted Critical
Publication of GB2077065B publication Critical patent/GB2077065B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/16—Layers for recording by changing the magnetic properties, e.g. for Curie-point-writing
    • 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
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
    • H01F10/13—Amorphous metallic alloys, e.g. glassy metals
    • H01F10/133—Amorphous metallic alloys, e.g. glassy metals containing rare earth metals
    • H01F10/135—Amorphous metallic alloys, e.g. glassy metals containing rare earth metals containing transition metals
    • H01F10/136—Amorphous metallic alloys, e.g. glassy metals containing rare earth metals containing transition metals containing iron

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
GB8105358A 1980-02-23 1981-02-20 Magnetooptic memory medium Expired GB2077065B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2191080A JPS56119951A (en) 1980-02-23 1980-02-23 Magneto-optical recorder and its production
JP2598080A JPS56119991A (en) 1980-02-27 1980-02-27 Optical memory device

Publications (2)

Publication Number Publication Date
GB2077065A GB2077065A (en) 1981-12-09
GB2077065B true GB2077065B (en) 1985-01-09

Family

ID=26359048

Family Applications (2)

Application Number Title Priority Date Filing Date
GB8105358A Expired GB2077065B (en) 1980-02-23 1981-02-20 Magnetooptic memory medium
GB08401050A Expired GB2140635B (en) 1980-02-23 1984-01-16 Magnetooptic memory medium

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB08401050A Expired GB2140635B (en) 1980-02-23 1984-01-16 Magnetooptic memory medium

Country Status (3)

Country Link
DE (1) DE3106653C2 (en)
FR (1) FR2476892B1 (en)
GB (2) GB2077065B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414650A (en) * 1980-06-23 1983-11-08 Sharp Kabushiki Kaisha Magneto-optic memory element
JPS5778652A (en) * 1980-11-01 1982-05-17 Daido Steel Co Ltd Thermal magnetic recording carrier and thermal magnetic recording system
CA1190321A (en) * 1981-10-29 1985-07-09 Toshihisa Deguchi Magneto-optical head assembly
DE3309483C3 (en) * 1982-03-17 2003-02-27 Canon Kk Magneto-optical recording material and its use
DE3348423C2 (en) * 1982-05-10 1994-11-17 Canon Kk Use of an amorphous magnetic quaternary GdTbFeCo alloy for the production of a magneto-optical recording layer
JPS5961011A (en) * 1982-09-30 1984-04-07 Ricoh Co Ltd Optical magnetic recording medium
JPS59178641A (en) * 1983-03-29 1984-10-09 Kokusai Denshin Denwa Co Ltd <Kdd> Photomagnetic recording medium
EP0125536A3 (en) * 1983-05-11 1986-06-25 MOVID Information Technology, Inc. Thermo-magnetic recording materials supporting small stable domains
US4586161A (en) * 1983-05-11 1986-04-29 General Electric Company Permanent thermo-magnetic recording of binary digital information
US4737947A (en) * 1983-06-14 1988-04-12 Canon Kabushiki Kaisha Recording medium having optomagnetic recording layer and optical recording layer with guide tracks of specific reflectance
DE3512715A1 (en) * 1984-04-09 1985-10-24 Victor Company Of Japan, Ltd., Yokohama, Kanagawa METHOD AND DEVICE FOR RECORDING AND PLAYING BACK SIGNALS BY MEANS OF RECORDING DISKS
DE3536210A1 (en) * 1984-10-11 1986-04-17 Hitachi, Ltd., Tokio/Tokyo Magneto-optical recording medium
US4751142A (en) * 1985-09-18 1988-06-14 Kyocera Corporation Magneto-optical recording element
NL8901345A (en) * 1989-05-29 1990-12-17 Philips Nv METHOD AND APPARATUS FOR RECORDING SIGNALS ON A RECORD CARRIER, A METERING METHOD AND MEASURING DEVICE FOR USE IN THE RECORDING METHOD AND RECORD DEVICE, AND A RECORD CARRIER
TW241359B (en) * 1993-08-04 1995-02-21 Philips Electronics Nv

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1277344B (en) * 1964-07-06 1968-09-12 Siemens Ag Procedure for information storage and memory storage for carrying out the procedure
BE793138A (en) * 1971-12-21 1973-04-16 Siemens Ag MAGNETO-OPTICAL MEMORY LAYER
NL174591C (en) * 1973-02-09 1984-07-02 Philips Nv DISC REGISTRATION CARRIER BODY.
US3816237A (en) * 1973-02-26 1974-06-11 Ibm Optically inactive magneto-optic substrate
US4126494A (en) * 1975-10-20 1978-11-21 Kokusai Denshin Denwa Kabushiki Kaisha Magnetic transfer record film
JPS52109193A (en) * 1976-03-11 1977-09-13 Kokusai Denshin Denwa Co Ltd Magnetoooptic memory medium
NL7713503A (en) * 1977-12-07 1979-06-11 Philips Nv Thermomagnetic information recorder e.g. for laser beams - has active layer of gadolinium, iron and holmium, dysprosium or terbium
US4412264A (en) * 1979-10-22 1983-10-25 Kokusai Denshin Denwa Co., Ltd. Magneto-optic recording medium

Also Published As

Publication number Publication date
DE3106653A1 (en) 1982-01-21
DE3106653C2 (en) 1988-05-05
FR2476892A1 (en) 1981-08-28
FR2476892B1 (en) 1987-11-27
GB2140635A (en) 1984-11-28
GB2140635B (en) 1985-06-19
GB8401050D0 (en) 1984-02-15
GB2077065A (en) 1981-12-09

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20010219