Magnetoresistance detection device having noise suppression

Details Magnetoresistance detection device having noise suppression Magnetoresistance detection device having noise suppression

1976-01-15

1977-07-26

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

340174TF, G01R 3302

Patent

active

040385973

ABSTRACT:
A magnetoresistive detection device for determining the presence or absence of a single-wall magnetic domain at a position in a thin layer of magnetic material in which stable single-wall magnetic domains can be moved, comprising a sensing element of magnetoresistive material which is provided with respect to the layer of magnetic material in such manner that the resistance thereof varies when a single-wall magnetic domain is present at the said position. The device comprises means to produce an alternating magnetic field so as to modulate the size of a single-wall magnetic domain present at the said position, and comprises a filter which passes only interference-free terms of the signal detected by the sensing element.

REFERENCES:
patent: 3842407 (1974-10-01), Argyle et al.
patent: 3899779 (1975-08-01), Malozemoff
Almasi et al., Magnetoresistive Detector for Bubble Domains, Jour. of App. Phys., vol. 42, No. 4, Mar. 1971, pp. 1268-1269.
Walker, E., Magnetoresistive Detector, IBM Tech. Bul., vol. 15, No. 2, July 1972, p. 500.
Takahashi et al., Ring Type Permalloy Detector, IEEE Trans. on Mag., Sept. 1972, pp. 462-464.

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