Magnetooptical recording medium

Details Magnetooptical recording medium Magnetooptical recording medium

1995-06-07

1997-05-06

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694ML, 428694RE, 428694MM, 428694MT, 428694EC, 428900, 360131, 360135, 365122, 368 13, 368 14, G11B 566

Patent

active

056269650

ABSTRACT:
A magnetooptical recording medium includes a substrate formed with a guide groove for tracking a laser beam, and first and second magnetic layers which are stacked on the substrate and each of which consists of an amorphous heavy rare earth-transition metal alloy. The first and second magnetic layers are magnetically coupled to each other. The first magnetic layer has a relatively high Curie temperature and a relatively low coercivity at room temperature, and the second magnetic layer has a relatively low Curie temperature and a relatively high coercivity at room temperature. The film thickness t.sub.1 of the first magnetic layer and the film thickness t.sub.2 of the second magnetic layer satisfy a condition t.sub.2 /t.sub.1 .gtoreq.2.5.

REFERENCES:
patent: 4753853 (1988-06-01), Sato
patent: 5030512 (1991-07-01), Kato
patent: 5094925 (1992-03-01), Ise
patent: 5248565 (1993-09-01), Tsutsumi

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