Method of magneto-optically recording/erasing information and ma

Details Method of magneto-optically recording/erasing information and ma Method of magneto-optically recording/erasing information and ma

1989-09-27

1992-12-29

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365122, 428694, G11B 1304, G11B 1114

Patent

active

051757141

ABSTRACT:
A magneto-optical recording medium including a recording layer and a bias layer being stacked one upon the other to apply coupling interaction which is mainly magnetostatic interaction to each other, the bias layer having a magnetization-reversing temperature higher than that of the recording layer. The medium is irradiated with laser beam pulses having a recording level and an erasing level lower than the recording level, thereby recording and erasing the information. When the medium is irradiated with the laser beam pulse having the recording level and the irradiated region is cooled to the magnetization reversing temperature T.sub.rR, the magnetization of the beam-irradiated region of the recording layer is aligned with a direction of the leakage magnetic field leaking from the recording layer. When the medium is irradiated with the laser beam pulse having the erase level and the irradiated region is cooled to T.sub.rR, direction of magnetization of the beam-irradiated region of the recording layer is aligned with a direction of the leakage magnetic field applied from the bias layer to the recording layer.

REFERENCES:
patent: 4649519 (1987-03-01), Sun et al.
patent: 4751142 (1988-06-01), Arimune et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4794560 (1988-12-01), Bell et al.
patent: 4855975 (1989-08-01), Akasaka et al.

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