Thin film magnetic head for perpendicular recording and reproducing
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United States of America Patent
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Nov 27, 1990
Grant Date -
N/A
app pub date -
Jun 5, 1989
filing date -
Sep 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thin film magnetic head for perpendicularly recording and reproducing is disclosed. The magnetic head comprises a main magnetic pole of a thin film, a spiral coil of an electrically conductive film disposed on one side of the main magnetic pole, a first auxiliary magnetic pole of a thin film covering the coil, and a second auxiliary magnetic pole disposed on the other side of the main magnetic pole, forming a substrate or being formed on a non-magnetic substrate. The distributed magnetic leakage path between the main magnetic pole and the second auxiliary magnetic pole plays an important role in the present invention. When the second auxiliary magnetic pole is properly arranged, the magnetic flux flowing through two magnetic paths and interlinking the coil, are cancelled by each other and edge noise due to magnetic flux generated at the second auxiliarly magnetic pole by a magnetic transition of the recording medium is minimized. The low edge noise characteristic enhances the recording and reproducing efficiency of the thin film magnetic head.
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