Integrated gradiometer

Details Integrated gradiometer Integrated gradiometer

2006-10-24

2006-10-24

Ledynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S252000, C324S244000

Reexamination Certificate

active

07126331

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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Johnson et al, Hybrid Hall Vector Magnetometer, Patent Application filed Nov. 4, 2002, Serial. Number (not yet assigned).

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