Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1992-07-20
1996-08-20
Kiliman, Leszek
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428634SC, 428634DE, 428634RE, 428634NF, 428634RL, 428634MM, 428634EC, 428900, 365122, 363 13, G11B 566
Patent
active
055477739
ABSTRACT:
A magnetooptic recording medium is composed of a transparent substrate, first and second magnetic layers and a reflecting layer. The first magnetic layer is formed on the transparent substrate and exhibits a large magneto-optical effect and has an axis of easy magnetization that is perpendicular to the film surface. The first magnetic layer is made of a Gd--Fe--Co amorphous alloy that is dominant in the iron group sublattice magnetization and the saturation magnetization lies within a range from 50 to 300 emu/cc. The second magnetic layer is formed on the first magnetic layer and has a larger coercive force at the room temperature than that of the first magnetic layer and a Curie temperature or a magnetic compensation temperature lower than that of the first magnetic layer and an axis of easy magnetization that is perpendicular to the film surface. The second magnetic layer is made of an R--Fe--Co amorphous alloy (R is an element of at least one kind of Tb and Dy) that is dominant in the iron group sublattice magnetization and the saturation magnetization lies within a range from 0 to 200 emu/cc. The first and second magnetic layers are exchange-coupled.
REFERENCES:
patent: 4628485 (1986-12-01), Tanaka et al.
patent: 4753853 (1988-06-01), Sato et al.
patent: 4799114 (1989-01-01), Tsunashima
patent: 4842956 (1989-06-01), Kobayashi
patent: 4855975 (1989-08-01), Akasaka et al.
Takahashi, et al., "Study on Disk Structures of Magneto-Optical Disc by a Numerical Simulation Method", The Japan Society of Applied Magnetism, 2PB-7, 1988.
Canon Kabushiki Kaisha
Kiliman Leszek
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