Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1982-09-23
1984-08-14
Pianalto, Bernard D.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428339, 428403, 428457, 428694, 428900, H01F 1002
Patent
active
044657358
ABSTRACT:
An improved magnetic recording medium suitable for high density recording is disclosed, which has a squareness ratio in the vertical direction of 0.6 or more and an orientation ratio (squareness ratio in the vertical direction/squareness ratio in the lengthwise direction) of 0.7 or more, prepared from acicular magnetic iron oxide particles having crystalline magnetic anisotropy and a ratio of Fe.sup.2+ /Fe.sup.3+ of 0.05 or less uniformly cobalt-doped, the particles having preferably a particle size of 0.3.mu. or less and an axial ratio of 6 to 10.
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patent: 4237506 (1980-12-01), Manly
patent: 4302523 (1981-11-01), Audran et al.
patent: 4303699 (1981-12-01), Tamura
patent: 4315052 (1982-02-01), Takahashi et al.
patent: 4337288 (1982-06-01), Takenaka et al.
Aoyama Shigeo
Togawa Fumio
Hitachi Maxell Ltd.
Pianalto Bernard D.
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