Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1989-01-06

1990-05-08

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

365122, 369 13, 369288, 428681, 428900, G11B 724

Patent

active

049237659

ABSTRACT:
A magneto-optical recording medium made of a rare-earth-transition metal amorphous film provides a compensation temperature Tcomp of 50.degree.-200.degree. C. or 0.degree. C. or less. This compensation temperature decreases a saturation magnetization Ms during recording, thereby preventing the provision of inverted magnetic domains at the centers of recording domains resulting from the demagnetizing field generated by the strength distribution of laser light, and so improving a carrier-to-noise ratio during reading. In the case of using a Tb-Fe-Co system amorphous film, Tcomp of 50.degree.-200.degree. C. may be give by the composition comprising Tb of 24-30 atomic %, Co of 7-20 atomic % and Fe of the rest, and Tcomp of 0.degree. C. or less may be given by the composition comprising Tb of 18-21.5 atomic %, Co of 8-10 atomic % and Fe of the rest.

REFERENCES:
patent: 4438508 (1984-03-01), Urner-Willie et al.
patent: 4518657 (1985-05-01), Yanagida
patent: 4670353 (1987-06-01), Sakurai
"Aging Effects on Amorphous Tb-Transition-Metal Film . . . ", J. Appl. Physics, 57(1), Apr. 15, 1985, p. 3900.

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