Magnetic field sensor and instrument comprising such a sensor

Details Magnetic field sensor and instrument comprising such a sensor Magnetic field sensor and instrument comprising such a sensor

1995-04-17

1997-11-11

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

338 32R, G01R 3309, H01L 4308

Patent

active

056868375

ABSTRACT:
A magnetic field sensor is composed of layered magnetoresistive elements which are arranged in a bridge on a substrate. The magnetoresistive elements comprise two ferromagnetic layers which exhibit an uni-axial anisotropy in one plane and are separated by a non-ferromagnetic layer. During the manufacture of the sensor the magnetization directions of these ferromagnetic layers are laid down so that two elements in two adjacent branches of the bridge exhibit an opposed sensitivity to external magnetic fields. Moreover, in each magnetoresistive element the magnetization of a ferromagnetic layer is adjusted substantially perpendicularly to the magnetization direction of the other ferromagnetic layer. As a result auxiliary fields are no longer required for the measurement of small magnetic fields and the sensor is substantially free of hysteresis and has an enhanced linearity.

REFERENCES:
patent: 4093917 (1978-06-01), Haeussermann
patent: 4639807 (1987-01-01), Sekizawa et al.
patent: 4851771 (1989-07-01), Ikeda et al.
patent: 5055786 (1991-10-01), Wakatsuki et al.
patent: 5206590 (1993-04-01), Dieny et al.
patent: 5422571 (1995-06-01), Gorney et al.
"GMR Materials For Low-Field Applications" J.M. Daughton et al, IEEE Transactions On Magnetics, vol. 29, p. 7705, 1994.

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