Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2007-05-02
2009-12-22
Patidar, Jay M (Department: 2858)
Electricity: measuring and testing
Magnetic
Displacement
C324S207250, C324S252000, C438S003000, C438S048000
Reexamination Certificate
active
07635974
ABSTRACT:
A magnetic field angle sensor for measurement of a magnetic field angle over a 360° range has magnetic tunnel junction elements oriented at multiple angles. The magnetic field angle sensor includes multiple magnetic tunnel junction elements formed on a substrate that have an anti-ferromagnetic layer and pinned synthetic multiple layer. The magnetic tunnel junction elements are patterned to have a large dimensional aspect ratio and large anisotropies the pinned synthetic multiple layer of the magnetic tunnel junction elements. The magnetic tunnel junction elements are annealed in the presence of a strong magnetic field in a direction of the reference axis and the annealed for a second time with no external magnetic field so that exchange pinning is reduced and strong stress induced anisotropies of the pinned synthetic multiple layer align magnetization of the pinned synthetic multiple layer align a long axis of each of the magnetic tunnel junction elements.
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Guo Yimin
Wang Po-Kang
Ackerman Stephen B.
Knowles Billy
MagIC Technologies, Inc.
Patidar Jay M
Saile Ackerman LLC
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