Chemistry: analytical and immunological testing – Measurement of electrical or magnetic property or thermal...
Reexamination Certificate
2011-07-12
2011-07-12
Yang, N. C. (Department: 1641)
Chemistry: analytical and immunological testing
Measurement of electrical or magnetic property or thermal...
C436S526000, C436S151000, C436S806000, C429S010000, C435S287100
Reexamination Certificate
active
07977111
ABSTRACT:
A magnetic sensor for identifying small superparamagnetic particles bonded to a substrate contains a regular orthogonal array of MTJ cells formed beneath that substrate. A magnetic field imposed on the particle, perpendicular to the substrate, induces a magnetic field that has a component within the MTJ cells that is along the plane of the MTJ free layer. If that free layer has a low switching threshold, the induced field of the particle will create resistance changes in a group of MTJ cells that lie beneath it. These resistance changes will be distributed in a characteristic formation or signature that will indicate the presence of the particle. If the particle's field is insufficient to produce the free layer switching, then a biasing field can be added in the direction of the hard axis and the combination of this field and the induced field allows the presence of the particle to be determined.
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Shi Xizeng
Wang Pokang
Yang Hsu Kai
Ackerman Stephen B.
MagIC Technologies, Inc.
Saile Ackerman LLC
Yang N. C.
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