Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1997-04-18
2000-03-28
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694SC, 428694RE, 428694MM, 428694EC, 428900, 369 13, 369283, G11B 566
Patent
active
060429542
ABSTRACT:
An magneto-optical recording medium includes: a transparent dielectric layer; a reproduction layer that is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature; a non-magnetic intermediate layer; a recording layer made of a perpendicularly magnetized film; and a protection layer, the layers being formed one after another in this order. The recording layer is made of a rare-earth and transition metal alloy, and the rare earth metal is composed of more than two kinds of rare-earth-metal elements containing Gd. The information stored in a magnetic recording domain is masked with respect to a part that is in an in-plane magnetization state. Consequently, recording can be performed with a less powerful laser beam, and each recording bit can be reproduced independently to produce high quality signals even if the converged light beam covers a neighboring recording bit within its radius.
REFERENCES:
patent: 4710434 (1987-12-01), Sato
patent: 4838962 (1989-06-01), Takayama
patent: 4880694 (1989-11-01), Takayama
patent: 5691072 (1997-11-01), Izumi et al.
K. Tamanoi et al., "Magnetically-Induced Super Resolution Unisng Magneto-Static Coupling," in Magneto-Optical Recording Symposium 1994, Digests of paper presented at MORIS '94, Sep. 27-29, 1994, Tokyo, Japan, 29-K-05, p. 126.
Hirokane Junji
Nakajima Junsaku
Nakayama Junichiro
Takahashi Akira
Conlin David G.
Kiliman Leszek
Manus Peter J.
Sharp Kabushiki Kaisha
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