Static information storage and retrieval – Information masking – Polarization
Patent
1995-05-30
1997-05-06
Fears, Terrell W.
Static information storage and retrieval
Information masking
Polarization
365215, G11C 1304, G11C 1142
Patent
active
056277776
ABSTRACT:
A magneto-optical recording medium includes a transparent substrate, a magnetic reproducing layer laminated on the transparent substrate and having an easy direction of magnetization perpendicular to a film surface, a nonmagnetic intermediate layer laminated on the magnetic reproducing layer, and a magnetic recording layer laminated on the nonmagnetic intermediate layer and having an easy direction of magnetization perpendicular to a film surface. When a reproducing laser beam is directed onto the recording medium, a temperature distribution is formed in a beam spot. The temperature distribution consists of a low-temperature region satisfying Hc>Hs and Hc>Hr, an intermediate-temperature region satisfying Hs>Hc and Hs+Hc>Hr, and a high-temperature region satisfying Hr>Hs+Hc, where Hc represents a coercive force of the reproducing layer, Hs represents a magnetostatic bonding force between the reproducing layer and the recording layer, and Hr represents a reproducing magnetic field. Two perpendicular magnetization masks are formed in the low-temperature region and the high-temperature region, and the magnetization of the recording layer is transferred to the reproducing layer by magnetostatic bond in the intermediate-temperature region.
REFERENCES:
patent: 5143798 (1992-09-01), Fujii
patent: 5224068 (1993-06-01), Miyake et al.
patent: 5278810 (1994-01-01), Takahashi et al.
patent: 5487046 (1996-01-01), Watada et al.
Shono Kenji
Tamanoi Ken
Fears Terrell W.
Fujitsu Limited
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