GMR SENSOR
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United States of America Patent
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Issued Date -
Apr 10, 2014
app pub date -
Nov 15, 2011
filing date -
Nov 15, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A system includes a first sensor, a field source, and a processor. The first sensor includes a surface and has an electrical resistance determined by a magnetic field at the surface. The field source is configured to provide a biasing magnetic field to the surface. The biasing magnetic field is aligned parallel to the surface and aligned perpendicular relative to the surface. The magnetic field has a frequency. The processor is coupled to the sensor and is configured to determine a parameter based on a measure of a change in the resistance. The change in the resistance corresponds to the resistance at a time before onset of a magnetic field perturbance at the surface and a time after the onset of the magnetic field perturbance at the surface.
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