Method for forming a GMR sensor having improved longitudinal...

Details Method for forming a GMR sensor having improved longitudinal... Method for forming a GMR sensor having improved longitudinal...

2005-09-20

2005-09-20

Tugbang, A. Dexter (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S603070, C029S603110, C029S603130, C029S603140, C029S603180, C216S062000, C216S063000, C216S066000, C360S324100, C360S324110, C360S324120, C360S324200, C427S127000, C427S128000, C451S005000, C451S041000

Reexamination Certificate

active

06944939

ABSTRACT:
A GMR sensor having improved longitudinal biasing is provided as is a method of forming it. The improved biasing is provided by longitudinal biasing structures in which a soft magnetic layer is interposed between a hard magnetic biasing layer and the lateral edge of the GMR sensor element. The soft magnetic layer eliminates the need for a seed layer directly between the hard magnetic layer and the GMR element and provides improved coupling to the free layer of the GMR element and a substantial reduction in random domain variations.

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“Design, Fabrication, and wafer Level Testing of (NiFe/Cu) xn Dual Strips GMR Sensors”; Paulo Freitas, Maria Caldeira and Markus Reissner; Sep. 1997; pp. 2905-2907.

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