GIANT MAGNETOIMPEDANCE IN COFEBSI WIRES AND POLYCRYSTALLINE FERRITES

Measurements of Giant magnetoimpedance (GMI) in Go-rich amorphous wire s are compared with magnetic measurements in polycrystalline ZnMn ferr ites as a function of frequency (5Hz-13MHz) and a superimposed de magn etic field, aiming to simulate GMI conditions. It is found that, excep t for the scale differences expected in these two different materials, frequency phenomena are essentially similar. In particular, both prop erties set can be represented by using the same equivalent-circuit app roach. These results point to a domain wall damping effect of the de f ield, and a reduced role of macroscopic eddy currents.