Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2004-06-30
2008-12-30
Tugbang, A. Dexter (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603150, C029S603180, C360S122000, C360S313000, C216S022000, C216S041000
Reexamination Certificate
active
07469465
ABSTRACT:
One illustrative method of fabricating a read sensor of a magnetic head includes the steps of forming a plurality of read sensor layers on a wafer; etching the read sensor layers to form a read sensor structure with a trench in front of the read sensor structure; forming a highly porous material within the trench; and slicing the wafer and lapping the sliced wafer through the highly porous material until an air bearing surface (ABS) of the magnetic head is reached. Advantageously, the highly porous material in front of the read sensor structure reduces mechanical stress on the read sensor during the lapping process. This reduces the likelihood that the amplitude of the read sensor will be degraded or set in a “flipped” or reversed orientation, as well as reduces the likelihood that electrostatic discharge (ESD) damage to the read sensor will occur.
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Ding Meng
Ho Kuok San
Lin Tsann
Tzeng Huey-Ming
Hitachi Global Storage Technologies - Netherlands B.V.
Nader Rambod
Oskorep, Esq. John J.
Tugbang A. Dexter
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