Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2004-10-29
2008-11-04
Davis, David D (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C029S603150
Reexamination Certificate
active
07446980
ABSTRACT:
A bi-layer, floating, trailing shield for use in a perpendicular magnetic recording system and a method for manufacturing such a trailing shield. Manufacturing the trailing shield as a bilayer trailing shield allows certain critical alignments to be maintained during lithography and allows high resolution photolithographic procedures to be used by allowing the use of a thinner resist, especially during construction of the first layer of the bilayer trailing shield structure. A trailing shield according to an embodiment of the invention improves magnetic performance of the write head by canting the magnetic write field from the write pole.
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E. Leung, M. Hayashi, R. Leung, K. Ino, N. Matono, S. Takahashi, M. Fujita, “Writer Performance Improvement in MR Head With Oversized Trailing Poles Technique,” Magnetics, IEEE Transactions on, vol. 34, Issue 4, Jul. 1998.
Davis David D
Hitachi Global Storage Technologies - Netherlands B.V.
Zilka-Kotab, PC
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