Magnetooptical recording and playback method employing multi-lay

Details Magnetooptical recording and playback method employing multi-lay Magnetooptical recording and playback method employing multi-lay

1990-08-29

1992-12-01

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, 365122, G11B 1304, G11B 1110, G11B 1112

Patent

active

051684829

ABSTRACT:
A high density magnetooptical recording and playback method is disclosed. The magnetooptical recording medium comprises a recording hold magnetic layer and a playback magnetic layer magnetically coupled with each other. Prior to the playback operation, the playback magnetic layer is initialized by an external magnetic field. A laser light is irradiated to locally heat the medium and cause transfer of magnetization in the recording hold magnetic layer to the playback magnetic layer. The signal is read out by the interaction of the laser light and the transferred magnetization.

REFERENCES:
patent: 3521294 (1970-07-01), Treves
patent: 4932012 (1990-06-01), Kobayashi
patent: 4955007 (1990-09-01), Aratani et al.
patent: 5051970 (1991-09-01), Ishii et al.
"Dual-Film Disk Hikes Magneto-Optic Density", 8032 Electronics, 59 (1986) Jun., No. 25, pp. 24-25.

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