Thin film magnetic head having thermal expansion layer for...

Details Thin film magnetic head having thermal expansion layer for... Thin film magnetic head having thermal expansion layer for...

2007-03-29

2010-12-07

Heinz, A. J. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125750

Reexamination Certificate

active

07848056

ABSTRACT:
A thin film magnetic head includes a main magnetic pole layer conducting a magnetic flux to the recording medium so that the recording medium an be magnetized in a direction orthogonal to a surface thereof; a return yoke layer disposed on a trailing side of the main magnetic pole layer; an intermediate protective layer partially disposed on a magnetic shield layer; and a thermal expansion suppressing layer having an edge located on the intermediate protective layer and being in contact with the return yoke layer in an area where the intermediate protective layer is not formed. If the thin film magnetic head is affected by ambient temperature environment, the thermal expansion suppressing layer suppresses the shift of the main magnetic pole layer and the return yoke layer toward the air bearing surface. This suppresses thermal protrusion from occurring on the thin film magnetic head due to ambient temperature environment.

REFERENCES:
patent: 7391590 (2008-06-01), Matono et al.
patent: 2006/0087765 (2006-04-01), Iwakura et al.
patent: A 5-182133 (1993-07-01), None
patent: A 6-168418 (1994-06-01), None
patent: A 2003-248907 (2003-09-01), None

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