Magneto-optical recording medium and method of recording and rep

Details Magneto-optical recording medium and method of recording and rep Magneto-optical recording medium and method of recording and rep

1995-05-03

1997-11-04

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694ML, 428694MT, 428694RE, 428694MM, 428694EC, 428900, 369 13, G11B 566, B32B 516

Patent

active

056838034

ABSTRACT:
A magneto-optical recording medium includes a first magnetic layer and a second magnetic layer being laminated. When information is to be recorded on the first magnetic layer, first, a magnetization direction in the second magnetic layer is arranged in one direction with an application of an initialization magnetic field. Then, an intensity modulated light beam is projected while applying thereto a recording magnetic field so as to change the magnetization direction in the second magnetic layer. Thereafter, the magnetization direction in the second magnetic layer is copied to the first magnetic layer, thereby recording information. The first magnetic layer has a magnetization in an intermediate direction between a perpendicular direction and an in-plane direction at room temperature, while has a perpendicular magnetization at above a predetermined temperature. Therefore, a smaller exchange coupling force is exerted from the first magnetic layer to the second magnetic layer at room temperature, thereby enabling a rewriting information with a smaller initialization magnetic field compared with the conventional method, thereby achieving a reduction in size of the apparatus and power conservation.

REFERENCES:
patent: 5204193 (1993-04-01), Sato et al.
patent: 5265073 (1993-11-01), Osato
patent: 5278810 (1994-01-01), Takahashi et al.
patent: 5420833 (1995-05-01), Tanaka et al.
patent: 5428585 (1995-06-01), Hirokane et al.
patent: 5428586 (1995-06-01), Kobayashi et al.
patent: 5452272 (1995-09-01), Murakami et al.

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