Magneto-optical recording medium

Details Magneto-optical recording medium Magneto-optical recording medium

1997-05-20

1999-08-17

Kiliman, Leszek

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428336, 428 643, 428694ML, 428634MM, 428694EC, 428694IS, 428694SC, 428694RE, 428694RL, 428900, 369 13, 369272, 369286, 369288, G11B 566

Patent

active

059391871

ABSTRACT:
A magneto-optical recording medium includes a reproducing layer which has in-plane magnetization at room temperature and has perpendicular magnetization at an elevated temperature of not less than a critical temperature, a recording layer made of a perpendicular magnetization film for recording information, an intermediate layer made of a non-magnetic film formed between the reproducing layer and the recording layer, and an in-plane magnetization layer adjacent to the reproducing layer, in which magnetization is reduced at a temperature in a vicinity of the critical temperature. According to the described magneto-optical recording medium, since information recorded in a recording magnetic domain of a portion having the in-plane magnetization is masked, even in the case where adjacent recording bits fall within a diameter of a spot of a converged light beam, each recording bit can be reproduced separately, thereby obtaining a quality reproduced signal.

REFERENCES:
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patent: 5563852 (1996-10-01), Murakami
patent: 5616428 (1997-04-01), Nishimura
patent: 5633838 (1997-05-01), Hirokane
patent: 5662988 (1997-09-01), Nakayama
J. Hirokane et al., "Magnetically Induced Superresolution Using Interferential In-Plane Magnetization Readout Layer", Jpn. J. Appl. Phys. vol 35, Part 1, No. 11, pp. 5701-5704, Nov. 1996.
K. Tamaoni, et al. "Magnetically Induced Superresolution using Magneto-Static Coupling", Magneto-Optical Recording International Symposium 1994, Digests of papers presented at Moris '94, Sep. 27-29, 1994 Tokyo, Japan, 29-K-05, p. 126.
Patent Abstract of Japan vol. 096, No. 00 4, Apr. 30, 1996, Publication No.: 07 320 319; Title: Magneto-Optical Recording Medium.
Tamanoi K et al.; "Magnetically-induced super resolution using magneto-Static coupling" Proceedings of Moris'94: Journal of the Magnetics Society of Japan , vol.17; No. Suppl S1, 2-279 Sep. 1994, Tokyo, JP, pp. 421-424.
Patent Abstract of Japan; vol. 096, No. 008, Aug. 30, 1996; Publication No.: 88 106 662; Title Magneto-Optical Recording Medium.

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