Method and apparatus for providing a magnetic storage and reproducing media with a keeper layer having a longitudinal anisotropy
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United States of America Patent
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Jan 19, 1999
Grant Date -
N/A
app pub date -
Aug 6, 1996
filing date -
Aug 6, 1996
priority date (Note) -
Expired
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Abstract
A magnetic storage medium comprises a keeper layer of soft magnetic, saturable material disposed upon a magnetic storage layer. The keeper layer is disposed above the magnetic storage layer, and a non-magnetic 'break' layer may be used between the keeper and the storage layer to reduce the exchange coupling between these layers. To increase the ability of the keeper layer to shunt flux from the magnetic storage layer, a longitudinal anisotropy is induced in the keeper layer. This establishes a desired magnetic orientation of the keeper which facilitates maintaining the regularity (i.e., relative uniformity) of the transitions, and reducing the magnetic interaction between transitions as the spacing between transitions is reduced to provide denser media. Specifically, the longitudinal anisotropy may be oriented either circumferentially or radially relative to the plane of rotation of the magnetic storage layer.
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