Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1998-09-29
2000-12-12
Kiliman, Leszek
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428336, 428694T, 428694TS, 428900, G11B 566
Patent
active
061595942
ABSTRACT:
A magnetic recording medium of the present invention comprises:
a substrate;
a nickel oxide underlayer formed on said substrate; and
a cobalt-containing maghemite thin film formed on said nickel oxide underlayer, having either a spacing of a (311) plane of not more than 2.510 .ANG., a spacing of a (222) plane of not more than 2.415 .ANG. or a spacing of a (220) plane of not more than 2.950 .ANG., and having the ratio of either of X-ray diffraction spectrum peak intensities of the (311), (222) or (220) planes of said cobalt-containing maghemite thin film to an X-ray diffraction spectrum peak intensity of the (400) plane of more than 0.5:1.
Such a magnetic recording medium has a higher coercive force, a higher saturation magnetization, less amount of noise generated, a large output in a high recording frequency region and less distortion of a reproduced waveform, and is suitable for use in current magnetic recording systems in which a ring-type magnetic write head is used.
REFERENCES:
patent: 5300314 (1994-04-01), Hayakawa et al.
patent: 5384175 (1995-01-01), Kojima et al.
patent: 5580671 (1996-12-01), Tamari et al.
patent: 5601904 (1997-02-01), Tamari et al.
patent: 5601908 (1997-02-01), Tamari
patent: 5851582 (1998-12-01), Tamari
Doi Takanori
Kakihara Yasuo
Nakata Kenichi
Tamari Kousaku
Kiliman Leszek
Toda Kogyo Corporation
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