Magneto-optical storage medium and magneto-optical overwrite sys

Details Magneto-optical storage medium and magneto-optical overwrite sys Magneto-optical storage medium and magneto-optical overwrite sys

1990-04-20

1992-08-25

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 365122, 369110, G11B 712, G11B 1112, G11B 1304

Patent

active

051425130

ABSTRACT:
A magneto-optical storage medium and overwrite system comprises a first magnetic layer (reading/writing layer) (3), a second magnetic layer (auxiliary layer) (5) and a third magnetic layer (initializing layer) (7), each of which is a rare earth-transition metal alloy, and interface layers (4,6) for isolating magnetic exchange interaction between the magnetic layers, respectively. The second magnetic layer is initialized by the magnetization of the third magnetic layer (7) at room temperature. The first magnetic layer and/or the second magnetic layer is heated by a laser beam (P1) for demagnetization and remagnetization. The demagnetized portion of the second magnetic layer is remagnetized to the opposite direction by the demagnetizing field from the periphery. The demagnetized portion of the first magnetic layer is remagnetized to the same direction of the second magnetic layer.

REFERENCES:
patent: 4658388 (1987-04-01), Ishiwatari et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4794560 (1988-12-01), Bell et al.
patent: 4878132 (1989-10-01), Aratani et al.
patent: 4908809 (1990-03-01), Tadokoro et al.
Electronics, Apr. 16, 1987, p. 33.

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