JPS57189362A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS57189362A JPS57189362A JP7203481A JP7203481A JPS57189362A JP S57189362 A JPS57189362 A JP S57189362A JP 7203481 A JP7203481 A JP 7203481A JP 7203481 A JP7203481 A JP 7203481A JP S57189362 A JPS57189362 A JP S57189362A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- magnetization
- constituted
- film
- magnetized
- 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.)
- Pending
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
- 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
Landscapes
- Thin Magnetic Films (AREA)
Abstract
PURPOSE:To improve the S/N during reading out and to make writing relatively easy by performing recording from a Tb-Fe film side of large coercive force and reading out from a Gd-Fe film side. CONSTITUTION:A disc 7 is constituted of a recording layer 7b constituted of a material of large coercive force Hc, a Tb-Fe layer, and a read-out layer 7a of small Hc which causes transfer magnetization when said layer is magnetized, a Gd-Fe layer. The laser condensed by a condenser lens 6 elevates the film temp. of the 1st layer 7b to a temp. higher than the Curie point of the material constituting the 1st layer and when magnetization inversion is caused in the direction perpendicular to the film plane in the 1st layer 7b by appling bias magnetization with bias magnetization 8, the 2nd layer 7a is magnetized by the magnetization of the 1st layer 7b. The layer 7b and the layer 7a are fixed as one body on a turntable 19, and are so constituted as to be turned around a spindle 21 by a motor 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7203481A JPS57189362A (en) | 1981-05-13 | 1981-05-13 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7203481A JPS57189362A (en) | 1981-05-13 | 1981-05-13 | Magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57189362A true JPS57189362A (en) | 1982-11-20 |
Family
ID=13477714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7203481A Pending JPS57189362A (en) | 1981-05-13 | 1981-05-13 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57189362A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59168954A (en) * | 1983-03-17 | 1984-09-22 | Sanyo Electric Co Ltd | Optical magnetic recording medium |
| JPS59208706A (en) * | 1983-05-12 | 1984-11-27 | Daido Steel Co Ltd | Thermomagnetic recording material |
| JPS60177455A (en) * | 1984-02-22 | 1985-09-11 | Nippon Kogaku Kk <Nikon> | Photomagnetic recording medium for curie point writing |
-
1981
- 1981-05-13 JP JP7203481A patent/JPS57189362A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59168954A (en) * | 1983-03-17 | 1984-09-22 | Sanyo Electric Co Ltd | Optical magnetic recording medium |
| JPS59208706A (en) * | 1983-05-12 | 1984-11-27 | Daido Steel Co Ltd | Thermomagnetic recording material |
| JPS60177455A (en) * | 1984-02-22 | 1985-09-11 | Nippon Kogaku Kk <Nikon> | Photomagnetic recording medium for curie point writing |
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