Magneto-optical recording medium comprising recording layer and

Details Magneto-optical recording medium comprising recording layer and Magneto-optical recording medium comprising recording layer and

1992-05-19

1993-02-16

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1304, G11B 1112, G11B 1110

Patent

active

051876949

ABSTRACT:
A magneto-optical information storage medium includes a substrate, a recording layer formed on the substrate and having an axis of easy magnetization extending in the direction perpendicular to its surface, a nonmagnetic layer formed on the recording layer, and a bias layer, formed on the nonmagnetic layer, for generating bias magnetic field H.sub.B (T) in accordance with a temperature. The magnetization of the recording layer is reversed by bias magnetic field H.sub.B (T) in first and second magnetization reversal temperature regions T.sub.W and T.sub.E (T.sub.W >T.sub.E). Information is recorded on such a magneto-optical information storage medium by radiating a first laser beam having a first power level for heating an irradiated portion to a temperature in region T.sub.W. In addition, information erasing is performed by radiating a second laser beam having a second power level which is lower than the first power level and heats an irradiated portion to a temperature in region T.sub.E. Overwrite is performed by power-modulating between the first and second power levels and radiating the modulated laser beam onto a previously recorded area of the medium.

REFERENCES:
patent: 4649519 (1987-03-01), Sun et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4794560 (1988-12-01), Bell et al.
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 4825428 (1989-04-01), Toki
"Single Beam Overwrite Method Using Multilayered Magneto-Optical Medium" by M. Sato et al p. 721 (28p-ZL-3).

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