Magnetoresistive displacement sensor and variable resistor using

Details Magnetoresistive displacement sensor and variable resistor using Magnetoresistive displacement sensor and variable resistor using

1996-12-23

1999-08-10

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 32420724, 338 32R, G01B 700, G01R 3302, H01L 4300, H01L 4308

Patent

active

059364009

ABSTRACT:
The displacement sensor employing a magnetoresistive effect laminate structure consisting of a bottom ferromagnetic layer with a field oriented in one direction, a middle non-magnetic layer, and a top softer magnetic layer. The top softer magnetic layer has two regions of opposing magnetic fields separated by a domain wall, where the magnetic field in one region is aligned with the bottom layer magnetic field. The resistance of the laminate structure changes as the location of the domain wall changes. In one improvement, the domain wall is induced by a pair of opposing semicylindrical magnets magnetized along their semicylindrical surface, forming parallel field lines and leading to a stronger domain wall. In another improvement, there are four laminate structures in an electrical bridge configuration. The bridge is excited by an alternating current source and the output is synchronously measured. The laminate structures are arranged in either a stack or such that pairs of laminate structures are deposited on opposite sides of a common substrate.

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