Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1998-03-02
2000-11-14
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
3692752, 428694EC, G11B 1100
Patent
active
06147939&
ABSTRACT:
A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.
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H. Awano, et al, Magnetic Domain Expansion Readout for Amplification of an Ultra High Density Magneto-Optical Recording Signal, published by American Institute of Physics (1996).
H. Awano, et al., Ultra High Density Magneto-Optical Disk Using Magnetic Domain Expansion Reproducing, published by Abstracts of Papers of Twentieth Japan Applied Magnetics conference (1996), 22pE-4, p. 313.
Copy of Communication dated May 20, 1998, issued by the European Patent Office re corresponding EPA No. 98104044-7.
Hirokane Junji
Iketani Naoyasu
Mieda Michinobu
Mori Go
Murakami Yoshiteru
Chu Kim-Kwok
Conlin David G.
Dinh Tan
Sharp Kabushiki Kaisha
Tucker David A.
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