Very high sensitivity GMR spin-valve magnetometer

Very high sensitivity GMR spin-valve magnetometer

A NiFe/Co/Cu GMR spin-valve magnetometer is designed, built, and tested. Thin-film flux-concentrators provide 50/spl times/ gain, yielding hysteresis-free sensitivity 1/R dR/dH=11%/0e in a 1 mm/sup 2/, internally temperature compensated device. Detection levels of 2 /spl mu/Oe/(Hz)/sup 1/2/ (at 1 Hz...

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Veröffentlicht in:IEEE transactions on magnetics 1997-09, Vol.33 (5), p.3385-3387
Hauptverfasser: Smith, N., Zeltser, A.M., Yang, D.L., Koeppe, P.V.
Format: Artikel
Sprache:eng
Schlagworte:
Hysteresis
Magnetometers
Noise level
Temperature sensors
Testing
Thin film devices
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Beschreibung
Zusammenfassung:A NiFe/Co/Cu GMR spin-valve magnetometer is designed, built, and tested. Thin-film flux-concentrators provide 50/spl times/ gain, yielding hysteresis-free sensitivity 1/R dR/dH=11%/0e in a 1 mm/sup 2/, internally temperature compensated device. Detection levels of 2 /spl mu/Oe/(Hz)/sup 1/2/ (at 1 Hz) are limited by 1/f resistance noise in the GMR films, which is examined in detail. Improvement by 10/spl times/ is possible via increased device size, as well as lower noise MR films.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.617952