Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1981-09-28
1983-09-20
Pianalto, Bernard D.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
156656, 20412935, 20412955, 428469, 428694, 428900, H01F 1002, C23C 1500
Patent
active
044056770
ABSTRACT:
A method of post treatment to a continuous thin film magnetic medium designed for perpendicular recording comprising a substrate upon which is deposited a thin magnetic layer comprising acicular shaped crystalline magnetic particles with the crystallographic "c" axis of the crystal in each particle oriented parallel to the longitudinal axis of the particle acicula and the longitudinal axis of the acicular particles oriented substantially normal to the plane of said magnetic layer, the post treatment effectively increasing the separation between magnetic particles and thereby increasing their coercivity while decreasing their demagnetization field of the film. The method comprises the step of utilizing enhanced grain boundary reaction at the interganular boundary of the acicular particles either by diffusing the magnetic layer with a reagent or etching the magnetic layer with an etching agent. The magnetic layer may be initially fabricated, for example, by an electrochemical plating, sputtering or vaccuum deposited method.
REFERENCES:
patent: 4239835 (1980-12-01), Iijima et al.
Carothers, Jr. W. Douglas
Pianalto Bernard D.
Xerox Corporation
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