Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1979-10-05
1981-10-06
Pianalto, Bernard D.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428332, 428693, 428694, 428900, 428928, B32B 1500
Patent
active
042936217
ABSTRACT:
A recording medium consists of a composite amorphous magnetic material layer comprising a rare earth metal and an iron family metal, the composition ratio thereof being nonuniform in the perpendicular direction. Because of the nonuniform composition ratio, a minute magnetic domain can be formed stably, so that thermo magnetic recording at extremely high density and sensitivity can be effected. Where GdFe is employed as a suitable material, the thickness of a portion of the magnetic layer, which portion has a larger perpendicular magnetic anisotropy caused by the nonuniform composition ratio, is increased preferably in comparison with the other portion. Uniform thermo magnetic recording can be performed on the large area medium by covering the same with a transparent dielectric material layer having nonuniform thickness.
REFERENCES:
patent: 3091548 (1963-05-01), Dillon
lEEE Trans. on Magnetics, vol. Mag. 11, No. 5, 9-75, Bourne et al., 1332-1334.
Burilla et al., pp. 340-342, AIP Conference, 1976.
Funakashi et al., Japan J. Appl. Phys., vol. 14, (1975), No. 10, 1623-1624.
Esho, Sotaro, "Anomalous Magneto-optical Hystersis Loops of Sputtered Gd-Co Films", Proceedings of the 7th Conference on Solid State Device, Tokyo, 1975, Supplement to Japanese Journal of Applied Physics, vol. 15, 1976, pp. 93-98.
Nippon Hoso Kyokai
Pianalto Bernard D.
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