Magnetic sensor with permanent magnet bias layers

Details Magnetic sensor with permanent magnet bias layers Magnetic sensor with permanent magnet bias layers

1995-09-08

1997-01-07

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

338 32R, 360113, G11B 539, G01R 3309

Patent

active

055920829

ABSTRACT:
A magnetic sensor includes a magnetoresistive effect layer (MR layer), on which permanent magnet layers are superimposed, the permanent magnet layers having slanted edges forming an angle .phi. with respect to the direction of an electric current I. The electrical resistance of the permanent magnet layers is higher than that of the MR layer. Due to the N and S polarities of the opposing slanted edges, sections of the MR layer located between the opposing slanted edges are magnetized with the angle .phi. such that a single magnetic domain is formed. The direction of magnetization M is at an angle .phi. of approximately 45.degree. with respect to the electric current I, so that it is possible to detect a change in the electrical resistance of the MR layer whenever there is a change in the external magnetic field H. Since the sections of the MR layer located between the opposing slanted edges are effected by the single magnetic domain in a direction having the angle .phi. relative to the direction of the applied current, a reduction in Barkhausen noise can be achieved.

REFERENCES:
patent: 3256483 (1966-06-01), Broadbent
patent: 3840898 (1974-10-01), Bajorek et al.
patent: 4425593 (1984-01-01), Postma
patent: 5260652 (1993-11-01), Collver et al.
patent: 5420736 (1995-05-01), Heim et al.
patent: 5428491 (1995-06-01), Smith
patent: 5485334 (1996-01-01), Nix et al.

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