Magnetic disc apparatus
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United States of America Patent
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Mar 20, 2001
Grant Date -
N/A
app pub date -
Feb 16, 1999
filing date -
Feb 19, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a magnetic disc apparatus comprising a vertical two-layered magnetic recording (MR) medium and a mono-pole/MR composite head or ID/MR composite head, wherein the vertical two-layered magnetic recording medium includes a vertical magnetization film formed on an undercoat soft magnetic film having no magnetic domain wall structure. This eliminates the fatal defect of a conventional vertical two-layered medium that an undercoat soft magnetic film domain wall is easily shifted by an external magnetic field generated by motors for disc rotation and head positioning, causing demagnetization of the recording magnetization to lower the output. The magnetic disc apparatus according to the present invention enables to obtain a high output stability.
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