Connection between magnetic and magnetotransport properties in Co-based rapidly solidified alloys

The influence of a macroscopic uniaxial anisotropy, induced by field annealing, on the magneto-impedance effect (GMI) behaviour in Co71Fe4Si10B15 amorphous ribbons has been studied. Two kinds of samples, showing longitudinal or transverse domain pattern, have been obtained by means of suitable thermomagnetic treatments. The magneto-impedance features were investigated in the two specimens, and in particular a linear dependence of the GMI response, as a function of the distance between the electrical contacts, has been pointed out in both cases.