Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2008-04-29
2008-04-29
Kim, Paul D. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603130, C029S603140, C029S603150, C029S603180, C360S122000, C360S125330, C360S317000, C205S119000, C205S122000, C451S005000, C451S041000
Reexamination Certificate
active
11655465
ABSTRACT:
The present invention provides a thin film magnetic head achieving improved recording performance by sharpening recording magnetic field gradient as much as possible. The thin film magnetic head has a return yoke layer disposed on a trailing side of a magnetic pole layer, and width W3of an exposed surface of a lower TH specifying part in a TH specifying portion in the return yoke layer is equal to or larger than width W1of an exposed surface of the magnetic pole layer (W3≧W1), and is less than width W4of an exposed surface of an upper TH specifying part (W3<W4). Since a part (magnetic flux) of a magnetic flux emitted from the exposed surface to the outside flows in the exposed surface while being spread a little in the width direction, spread of the magnetic flux is suppressed at the time of recording. Therefore, the recording magnetic field gradient near an air bearing surface is sharpened and recording performance is improved.
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Kenyon & Kenyon LLP
Kim Paul D.
SAE Magnetics (H.K. ) Ltd.
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