Magnetic head for hard disk drive having varied composition...

Details Magnetic head for hard disk drive having varied composition... Magnetic head for hard disk drive having varied composition...

2005-07-05

2005-07-05

Letscher, George (Department: 2653)

Metal working

Method of mechanical manufacture

Electrical device making

C360S125330

Reexamination Certificate

active

06912771

ABSTRACT:
A magnetic head for a hard disk drive. The magnetic poles of the head are formed with a NiFe alloy having a graduated composition in which a higher Fe concentration is fabricated proximate the write gap layer between the magnetic poles. Each magnetic pole is fabricated in a single electroplating step in which the duty cycle of the electroplating current is altered during the electroplating operation. Where the duty cycle is greatest the Fe ion concentration is likewise greatest.

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patent: 5932082 (1999-08-01), Harris et al.
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