Magnetometer employing hard axis thin film inductor

Details Magnetometer employing hard axis thin film inductor Magnetometer employing hard axis thin film inductor

1978-08-28

1980-01-08

Wolff, John H.

Electricity: measuring and testing

Magnetic

Magnetometers

360111, G11B 534

Patent

active

041829875

ABSTRACT:
A flux-sensitive magnetic head employs, at its back part, a structure having a thin single domain magnetic film coated thereon. A coil wraps around the coated structure, and a direct current is passed through the coil, thereby to apply a hard axis magnetic bias to the film. Signal flux appearing at the head front gap asserts a magnetic force along the hard axis of the film. Contrary to what would be expected, the signal flux causes the inductance of the coil to vary. Such inductance variation may be conveniently detected by (1) connecting the variable inductor into a tank circuit, (2) applying a high frequency ac ripple to the "hard axis" dc bias, and (3) measuring the "hard axis" detuning experienced by the tank circuit.

REFERENCES:
patent: 3239754 (1966-03-01), Odom, Jr. et al.
patent: 3242269 (1966-03-01), Pettengill
patent: 3271665 (1966-09-01), Castro et al.
patent: 3400328 (1968-09-01), Penn et al.
patent: 3443213 (1969-05-01), Bader et al.
patent: 3829894 (1974-08-01), Watanabe et al.
patent: 4007417 (1977-02-01), Takeuchi et al.
IBM/TDB, vol. 20, No. 11B, Apr. 1978, "Magnetic Detector . . .," by Klokholm et al., pp. 4959-4960.

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