Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1997-02-20
1998-06-16
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
428694ML, 428694EC, G11B 1100
Patent
active
057682186
ABSTRACT:
A magneto-optical recording medium has a transparent substrate, a first magnetic layer, first intermediate layer, a second magnetic layer, and a third magnetic layer provided in this order. The first magnetic layer has an in-plane magnetization at room temperature, while a transition from the in-plane magnetization to a perpendicular magnetization occurs to the first magnetic layer with a temperature rise. The first intermediate layer is made of a non-magnetic substance. The second magnetic layer is a film having a perpendicular magnetization. The third magnetic layer is a film having a perpendicular magnetization, has a coercive force smaller than that of the second magnetic layer at room temperature, and has a Curie temperature higher than that of the second magnetic layer. The light intensity modulation overwriting method is applicable to the magneto-optical recording medium thus arranged, superior reproduction signal characteristics can be obtained with respect to this magneto-optical recording medium, and reproduction can be carried out with respect to the recording medium even though it has recording bits whose each diameter is smaller than that of a light beam. Thus it is possible to provide the magneto-optical recording medium suitable for high density recording.
REFERENCES:
patent: 5428585 (1995-06-01), Hirokane et al.
patent: 5554436 (1996-09-01), Katayama et al.
patent: 5623458 (1997-04-01), Matsumoto et al.
patent: 5631096 (1997-05-01), Nakajima et al.
Hirokane Junji
Murakami Yoshiteru
Nakayama Junichiro
Takahashi Akira
Conlin David G.
Dinh Tan
Michaelis Brian L.
Sharp Kabushiki Kaisha
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