Method of measuring magnetic field gradients
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United States of America Patent
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Feb 6, 2007
Issued Date -
N/A
app pub date -
Sep 29, 2006
filing date -
Jul 29, 2002
priority date (Note) -
Expired
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Abstract
Magnetic field sensors, each generating an electrical output signal in proportion to the local magnetic field, are lithographically fabricated on a semiconductor substrate with a small spatial separation. The lateral dimension of the sensors and the separation length are the order of the minimum lithographic feature size. Comparing the electrical signals of the sensors results in a measurement of the local magnetic field gradient. Large field gradients, that vary on a small spatial scale, may be associated small magnetic structures such as microscopic magnetic particles. Detection of a field gradient can be used to infer the presence of a magnetic particle.
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