Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-03-21
2006-03-21
Evans, Jefferson (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S324100
Reexamination Certificate
active
07016168
ABSTRACT:
A current-perpendicular-to-plane (CPP) giant magnetoresistive (GMR) sensor of the synthetic spin valve type is provided, the sensor comprising a GMR stack having a substantially square lateral cross-section, a Cu spacer layer of smaller square cross-section formed centrally on the GMR stack and a capped ferromagnetic free layer of substantially square, but even smaller cross-sectional area, formed centrally on the spacer layer. The stepped, reduced area geometry of the sensor provides a significant improvement in its GMR ratio (DR/R), a reduced resistance, R, and elimination of Joule heating hot-spots in regions of high resistance such as the antiferromagnetic pinning layer and its seed layer.
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Co-pending U.S. Appl. No. 10/392,118, filed Mar. 19, 2003, same assignee, “GMR Improvement in CPP Valve Head by Inserting a Current Channeling Layer (CCL)”.
Co-pending U.S. Appl. No. 10/718,372, filed Nov. 20, 2003, same assignee, “Self-Alignment Scheme for Enhancement of CPP-GMR”.
Chang Jeiwei
Ju Kochan
Li Min
Liao Simon
Zheng Youfeng
Evans Jefferson
Saile George O.
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