Stock material or miscellaneous articles – All metal or with adjacent metals – Having magnetic properties – or preformed fiber orientation...
Patent
1988-11-30
1989-11-21
Zimmerman, John J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having magnetic properties, or preformed fiber orientation...
428615, 428678, 428686, 428928, G11B 566, G11B 724
Patent
active
048822310
ABSTRACT:
The magneto-optical recording medium is disclosed which has a laminous structure with a first magnetic film suited to provide a large rotation angle of the plane of polarization by magneto-optical interaction, a third magnetic film having a great coercive force, and a second magnetic film interposed therebetween to magnetically couple the first and third magnetic films at room temperature, wherein such magnetic coupling is substantially interrupted at a temperature in a recording operation.
Upon recording signal on the medium, a laser beam is irradiated to the medium and raises the temperature of the medium near Curie temperature Tc3 of the third magnetic film, thus direction of the magnetization is determined by the magnetic field applied to the irradiated portion.
Upon cooling the irradiated portion, the second magnetic film serves to magnetically couple the first and third magnetic film, the magnetization of the third film is transferred to the first film. Thus the required magnetic field for recording is greatly reduced, and high C/N can be obtained resulting in high density recording.
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patent: 4777082 (1988-10-01), Ishizaki et al.
patent: 4789606 (1988-12-01), Yamada et al.
Sony Corporation
Zimmerman John J.
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