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Very high sensitivity GMR spin-valve magnetometer

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4 Author(s)
Smith, N. ; San Diego Labs., Eastman Kodak Co., San Diego, CA, USA ; Zeltser, Alexander M. ; Yang, D.L. ; Koeppe, P.V.

A NiFe/Co/Cu GMR spin-valve magnetometer is designed, built, and tested. Thin-film flux-concentrators provide 50× gain, yielding hysteresis-free sensitivity 1/R dR/dH=11%/0e in a 1 mm2, internally temperature compensated device. Detection levels of 2 μOe/(Hz)1/2 (at 1 Hz) are limited by 1/f resistance noise in the GMR films, which is examined in detail. Improvement by 10× is possible via increased device size, as well as lower noise MR films

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Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 5 )