Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2007-02-12
2010-06-22
Cao, Allen T (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Core
Reexamination Certificate
active
07742258
ABSTRACT:
A method for fabricating a magnetic head with a trapezoidal shaped pole piece tip is described. The body of the main pole piece is deposited; then one or more layers for the pole piece tip are deposited. A bed material is deposited over the pole piece tip material. A void is formed in the bed material over the area for the pole piece tip. The void is filled with an ion-milling resistant material such as alumina preferably using atomic layer deposition or atomic layer chemical vapor deposition. The excess ion-milling resistant material and the bed material are removed. The result is an ion-milling mask formed over the area for the pole piece tip. Ion milling is then used to remove the unmasked material in the pole piece tip layer and to form a beveled pole piece tip and preferably a beveled face on the main pole piece.
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Chen Tsung Yuan
Druist David Patrick
Le Quang
Lee Kim Y.
Wang Chun-Ming
Cao Allen T
Hitachi Global Storage Technologies - Netherlands B.V.
Knight G. Marlin
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