Sensor of weak magnetic fields, with magnetoresistive effect

Details Sensor of weak magnetic fields, with magnetoresistive effect Sensor of weak magnetic fields, with magnetoresistive effect

1992-12-16

1994-05-17

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

324252, H01L 4300, G01R 3302

Patent

active

053131860

ABSTRACT:
A sensor of weak magnetic fields with magnetoresistive effect features a metallic multilayer formed by alternating magnetic and non-magnetic metals. In order to detect weak fields, a sensor is described wherein a magnetic field is coupled by an anti-ferromagnetic type coupling with a first neighboring magnetic layer and by a ferromagnetic type coupling with a third neighboring magnetic layer, so that there is frustration of coupling. The first and third magnetic layers are blocked by their strong coercive field. The sensor finds particular application to detection on magnetic media.

REFERENCES:
patent: 5206590 (1993-04-01), Dieny et al.
Stearns, et al., Journal of Applied Physics, vol. 67, No. 9, May 1990, pp. 5925-5930. "Antiferromagnetic coupling between layers in Co/Cr multilayer (invited)".
Binasch, et al., Physical Review B: Condensed Matter, vol. 39, No. 7, Mar. 1989, pp. 4828-4830. "Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange".
Brubaker, et al., Applied Physics Letters, vol. 58, No. 20, May 1991, pp. 2306-2308. "Oscillatory interlayer magnetic coupling of sputtered Fe/Mo superlattices".

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