Method of magneto-optical recording and overwriting

Details Method of magneto-optical recording and overwriting Method of magneto-optical recording and overwriting

1992-09-21

1995-05-30

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

G11B 1304, G11B 1112, G11B 1110

Patent

active

054208360

ABSTRACT:
A method of magneto-optical recording and overwriting information onto a double-layer magneto-optical recording medium which has laminated first and second magnetic layers having different coercive forces at a lower operation temperature and a higher operation temperature of which one is a recording operation temperature and the other is an erasing operation temperature, without using an initializing external magnetic field. The method includes the steps of recording by applying a laser beam to an area of the recording medium at a power level corresponding to one of these operating temperatures and erasing by applying a laser beam to an area of the recording medium at a different power level corresponding to the other of the operating temperatures, while applying a bias magnetic field to the magneto-optical recording medium with the same magnetization direction during both recording and erasing, the intensity of the bias magnetic field being greater than the coercive forces of the first and second magnetic layers at the lower operation temperature.

REFERENCES:
patent: 4855975 (1989-08-01), Akasaka et al.
patent: 4882718 (1989-11-01), Kryder et al.
patent: 4910622 (1990-03-01), Saito et al.
patent: 4955007 (1990-09-01), Aratani et al.
"Single Beam Overwrite Method Using Multilayered Magneto-Optical Media", Nippon Kogaku K.K., 28P-ZL-3.

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