GB2077065B - Magnetooptic memory medium - Google Patents
Magnetooptic memory mediumInfo
- 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
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
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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)
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 |
DE3317101A1 (en) * | 1982-05-10 | 1983-11-10 | Canon K.K., Tokyo | Magneto-optical recording base |
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 |
GB2157876B (en) * | 1984-04-09 | 1988-09-21 | Victor Company Of Japan | Capacitance recording disc |
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)
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 |
-
1981
- 1981-02-20 GB GB8105358A patent/GB2077065B/en not_active Expired
- 1981-02-23 FR FR8103542A patent/FR2476892B1/en not_active Expired
- 1981-02-23 DE DE19813106653 patent/DE3106653C2/en not_active Expired
-
1984
- 1984-01-16 GB GB08401050A patent/GB2140635B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3106653C2 (en) | 1988-05-05 |
GB2140635B (en) | 1985-06-19 |
FR2476892A1 (en) | 1981-08-28 |
FR2476892B1 (en) | 1987-11-27 |
DE3106653A1 (en) | 1982-01-21 |
GB2140635A (en) | 1984-11-28 |
GB2077065A (en) | 1981-12-09 |
GB8401050D0 (en) | 1984-02-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PE20 | Patent expired after termination of 20 years |
Effective date: 20010219 |