Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-11-27
2007-11-27
Castro, Angel (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S324100, C360S324120, C360S324200, C029S603070, C029S603110, C029S603130, C029S603140, C029S603150, C029S603180, C427S127000, C427S128000, C451S005000, C451S041000
Reexamination Certificate
active
11210576
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 (Ni Fe/Cu)xn Dual Stripe GMR Sensors,” by Freitas et al., IEEE Trans. on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 2905-2907.
Guo Yimin
Zhu Li-Yan
Ackerman Stephen B.
Castro Angel
Headway Technologies Inc.
Magee Christopher R.
Saile Ackerman LLC
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