Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1991-05-02
1993-07-06
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428611, 428694TM, 428900, 428928, 428668, G11B 500
Patent
active
052252345
ABSTRACT:
A magnetic recording medium of the longitudinal recording type is comprised of a magnetic layer on one major surface of a non-magnetic substrate wherein the magnetic layer consists of at least two layers of cobalt-based ferromagnetic metal thin film which are formed by oblique evaporation at an incident angle varying between a maximum .theta.max and a minimum .theta.min. Assuming that the layers disposed close to and remote from the substrate are designated lowermost and uppermost layers, respectively, the lowermost layer of ferromagnetic metal thin film is deposited at a smaller .theta.max value than is the uppermost layer of ferromagnetic metal thin film. The uppermost layer is deposited at a greater .theta.min value than is the lowermost layer. The medium is improved in corrosion resistance and electromagnetic properties properties.
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Kobayashi Koji
Takai Mitsuru
Resan Stevan A.
TDK Corporation
Thibodeau Paul J.
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