Oriented granular giant magnetoresistance sensor

Details Oriented granular giant magnetoresistance sensor Oriented granular giant magnetoresistance sensor

1993-10-29

1995-06-06

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

324252, 360113, H01L 4300

Patent

active

054226210

ABSTRACT:
A giant magnetoresistance sensor incorporating an orientated granular layer wherein the layer has a copper matrix with magnetic particles of a nickel cobalt alloy wherein the magnetic particles have a magnetocrystalline anisotropy constant K.sub.1 in the range from 0 to 3.times.10.sup.4 ergs/cm.sup.3. Alternatively, a silver or gold matrix may be used with magnetic particles of a nickel-ion alloy. The granular layer preferably has a (100) texture to provide the magnetic particles with their easy axes in the plane of the layer. The magnetic particles have their largest dimension in the range from 40 to 400 angstroms. The invention overcomes the problem of requiring a large magnetic field to obtain the saturation .DELTA.R/R. By providing a granular film with magnetic particles of low anisotropy, the saturation field to obtain .DELTA.R/R may be as low as 10 to 20 Oe.

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