Magnetoresistive current sensor having high sensitivity

Details Magnetoresistive current sensor having high sensitivity Magnetoresistive current sensor having high sensitivity

1993-12-30

1995-10-24

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

338 32R, G01R 3300

Patent

active

054613086

ABSTRACT:
The present inventors have discovered that a compact, highly sensitive current sensor can be made for any inductive component having an air gap in its magnetic path by disposing a layer of magnetoresistive material in the path of the fringing magnetic field. In the preferred embodiment, a thin magnetoresistive film of La.sub.w Ca.sub.x Mn.sub.y O.sub.z on a LaAlO.sub.3 /Al.sub.2 O.sub.3 substrate provides a high sensitivity in the range of 1-100 mV/ampere of DC current in the inductive component. The current sensor consumes a very small amount of power and provides the desirable electrical isolation between the sensor and the active device circuit.

REFERENCES:
patent: 3519899 (1967-10-01), Yamada
patent: 3649912 (1972-03-01), Nakamura
patent: 4228473 (1980-10-01), Himuro et al.
patent: 5126667 (1992-06-01), Kataoka et al.
patent: 5159513 (1992-10-01), Dieny et al.
J. Cho, et al. "Ferromagnetic (LaSr)MnO.sub.3 Films Deposited by RF Sputtering" Japanese Journal of Applied Physics, vol. 29, No. 9 (1990).
B. E. Jones, "Mean-square ameter and d.c. transformer" Wireless World, vol. 77, pp. 17-19 (1970).

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