Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1998-02-25
2000-02-01
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694DE, 428694RL, 428694MM, 428694EC, 428694GR, 428694RE, 428900, 360131, 360135, 365122, 369 13, G11B 566
Patent
active
060200790
ABSTRACT:
A magneto-optical recording medium capable of performing magnetically induced super resolution reproduction by perfectly masking a mark adjacent to a mark to be reproduced. The magneto-optical recording medium includes a transparent substrate, a magnetic reproducing layer laminated on the transparent substrate, a magnetic control layer laminated on the reproducing layer, and a magnetic recording layer laminated on the control layer. The reproducing layer has an easy axis of magnetization in a plane at room temperature. Each of the control layer and the recording layer has an easy axis of magnetization perpendicular to the substrate. When a given reproducing power is applied to the medium, there are formed in a laser spot on the medium a low-temperature area where the direction of magnetization of the reproducing layer is made identical with an in-plane direction, an intermediate-temperature area where the magnetization of the recording layer is transferred through the control layer to the reproducing layer by exchange bond, and a high-temperature area whose temperature is higher than the Curie temperature of the control layer. In the low-temperature area, an in-plane mask is formed. In the high-temperature area, an up spin mask is formed. Further, an opening allowing a magneto-optical signal to be read is formed between the two masks.
REFERENCES:
patent: 5367509 (1994-11-01), Fukumoto
patent: 5481410 (1996-01-01), Osato et al.
patent: 5486395 (1996-01-01), Murakami et al.
patent: 5539709 (1996-07-01), Sato et al.
patent: 5723227 (1998-03-01), Matsumoto
Matsumoto Koji
Shono Keiji
Fujitsu Limited
Kiliman Leszek
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