Magneto-resistive magnetic field sensor with a constricted regio

Details Magneto-resistive magnetic field sensor with a constricted regio Magneto-resistive magnetic field sensor with a constricted regio

1997-06-11

1999-08-10

Strecker, Gerard

Electricity: measuring and testing

Magnetic

Magnetometers

338 32R, 360113, G01R 3309, G11B 539

Patent

active

059364025

ABSTRACT:
Two magnetic layers are mutually interconnected by a constricted region also made of a magnetic material. The layers may be separated by an intermediate non-metallic layer having a hole filed with magnetic material to from the constricted region. Alternatively, the layers and constricted region may be substantially co-planar. The constricted region minimum cross-section dimension preferably is less than one micron, and ideally of the order of 100 nm, thus being much smaller than the diameter of a magnetic domain. A high magneto-resistance ratio is obtained, and electrical and magnetic properties of the sensor can be adjusted largely independently.

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"Giant Magnetoresistance in Spin-Valve Multilayers", by B. Dieny, Journal of Magnetism and Magnetic Materials, vol. 136, 1994, pp. 335-359. (No Month).
"Anisotropic Magnetoresistance in Ferromagnetic 3d Alloys", by T.R. McGuire et al, IEEE Trans. Magnetics, vol. MAG-11, No. 4, Jul. 1975, pp. 1018-1038.
"Fabrication of Metallic Nanoconstrictions", by P.A.M. Holweg et al, Microelectronic Engineering, vol.l 11 1990, pp. 27-30, (No Month).

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