Magneto-optical method and apparatus for recording/reproducing d

Details Magneto-optical method and apparatus for recording/reproducing d Magneto-optical method and apparatus for recording/reproducing d

1994-11-14

1996-11-12

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1304

Patent

active

055747035

ABSTRACT:
To directly overwrite data on a magnito-optical recording medium formed of two exchange-coupled magnetic layers of a memory layer with a high coercive force and a low Curie point and a reference layer with a low coercive force and a high Curie point, an initializing magnetic field (e.g. 1000 to 5000 Oe) is applied to the medium to arrange the magnetization direction of only the reference layer; a recording magnetic field (e.g. 100 to 400 Oe) is applied and simultaneously a recording laser beam modulated according to data is irradiated upon the medium to record the data as magnetization directions of the memory layer; the initializing magnetic field is applied again to the medium to arrange the magnetization direction of only the reference layer; and a reproducing magnetic field (e.g. 1000 Oe or less) is applied and simultaneously a reproducing laser beam is irradiate, upon the medium to reproduce the data. Since the reproducing magnetic field the same in direction as the recording magnetic field is applied to the medium in reproducing operation, recorded data can be stably reproduced without destruction by use of a high sensitive recording medium, in particular.

REFERENCES:
patent: 4932012 (1990-06-01), Kobayashi
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5126986 (1992-06-01), Saito et al.

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