ABSTRACT We have selected stress-annealed nanocrystalline FeSiBCuNb ribbons for trilayer ferromagnetic/copper/ferromagnetic sensors exhibiting high magneto-impedance (MI) ratio. Longitudinal MI δZ reaches 450% at 60kHz. Measurements of responses of the GMI sensor on the small amplitude ac fields displays sensitivity of 60V/T up to a few 100Hz. The noise equivalent magnetic induction is equal to 13nT/Hz+1/2, limited to the added noise from electronics.
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