Magneto optical recording medium including a plurality of magnet

Details Magneto optical recording medium including a plurality of magnet Magneto optical recording medium including a plurality of magnet

1995-08-09

1997-05-06

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

428694MM, G11B 1100, G11B 570

Patent

active

056278039

ABSTRACT:
A magneto optical recording medium is provided with: a record layer, to which information is recorded as a directional condition of magnetization thereof and which comprises a magnetic substance having a Curie temperature Tc.sub.2 ; a reproduction layer, to which the magnetization of the record layer is transferred at a predetermined reproducing temperature Tpb and which comprises a magnetic substance having a Curie temperature Tc.sub.0 ; an intermediate layer disposed between the record layer and the reproduction layer and comprising a magnetic substance having a Curie temperature Tc.sub.1 for allowing the magnetization of the record layer to be transferred therethrough at a temperature lower than the Curie temperature Tc.sub.1 by a switched connection force between the record layer and the intermediate layer and by a switched connection force between the intermediate layer and the reproduction layer, and for disallowing the magnetization of the record layer to be transferred therethrough at a temperature not lower than the Curie temperature Tc.sub.1 ; and an intermediate auxiliary layer interposed between the record layer and the intermediate layer and comprising a magnetic substance having a Curie temperature Tc.sub.3 for increasing the switched connection force between the record layer and the intermediate layer. The Curie temperatures satisfy conditions of: Tc.sub.1 <Tpb<Tc.sub.2 <Tc.sub.0 and Tc.sub.1 .ltoreq.Tc.sub.3 .ltoreq.Tc.sub.2.

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patent: 5283770 (1994-02-01), Nakao et al.
patent: 5420728 (1995-05-01), Kawase

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