Dynamic magnetic information storage or retrieval – Head – Core
Patent
1998-05-06
2000-04-25
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
Core
G11B 5147
Patent
active
060551380
ABSTRACT:
The presently preferred method for fabricating the thin film magnetic head of the present invention includes depositing a first pole layer on a substrate or over a previously formed layer. A portion of the first pole layer is removed, such as by etching or ion milling, to form a first or lower pedestal pole extending from the first pole layer. A write gap layer is deposited and a second or upper pole is formed over the write gap layer. A magnetic flux generator is formed and coupled to the second pole. The magnetic flux generator supplies magnetic flux to the second pole. The first pedestal provides a return path for the flux supplied to the second pole and across the write gap. Typically, a second pedestal is formed by depositing a second pole layer and removing a portion, such as by etching or ion milling, to form the second or upper pedestal pole. The method of the present invention allows the first pedestal to be formed smaller than the second pole. This reduces flux width across the write gap which improves data density. In addition, the present invention provides the first pedestal pole with sidewalls substantially planar and substantially orthogonal to the lower pole layer for lower pedestal pole widths below 2 microns.
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Heinz A. J.
Read-Rite Corporation
LandOfFree
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