Magneto-optical recording medium and method of reproducing infor

Details Magneto-optical recording medium and method of reproducing infor Magneto-optical recording medium and method of reproducing infor

1997-11-17

2000-02-29

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428694RE, 428694MM, 428694EC, 428694GR, 428900, 369 13, 3692755, 3692754, 369284, 369286, 369288, 360 53, 360114, G11B 566

Patent

active

060307161

ABSTRACT:
A magneto-optical recording medium adapted for reproduction of a high resolution signal without the necessity of a reproducing magnetic field. The magneto-optical recording medium comprises a transparent substrate and deposits of a reproducing layer, a switch layer and a recording layer formed on the transparent substrate successively. The reproducing layer is a perpendicular magnetization film at a room temperature but is turned to an in-plane magnetization film when heated beyond a predetermined temperature. Each of the switch layer and the recording layer is a perpendicular magnetization film. The respective Curie temperatures Tc1, Tc2 and Tc3 of the reproducing layer, the switch layer and the recording layer satisfy the relationship of Tc1>Tc3>Tc2. When a reproducing laser beam is irradiated to the recording medium, the switched connection between the reproducing layer and the recording layer is interrupted in a high temperature region heated beyond the Curie temperature of the switch layer, whereby the reproducing layer is caused to present in-plane magnetization.

REFERENCES:
patent: 4518657 (1985-05-01), Yanagida
patent: 5016232 (1991-05-01), Tadokoro et al.
patent: 5094925 (1992-03-01), Ise et al.
patent: 5239534 (1993-08-01), Matsumoto
patent: 5309427 (1994-05-01), Matsumoto
patent: 5691072 (1997-11-01), Izumi et al.

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