Temperature dependence of asymmetric GMI profile

The giant magnetoimpedance (GMI) profiles have been measured as a function of measuring temperature from 300 down to 50 K for the Co-based amorphous r ibbons annealed in vacuum (A-sample) and in open air (B-sample) under the a nnealing field of 3 Oc. The contribution of wall motion on GMI decreases mo re sensitively with the decreasing temperature than that of rotational magn etization in both samples. The asymmetry and hysteresis of the profiles for increasing and decreasing fields also decrease with the decreasing tempera ture. (C) 2001 Elsevier Science B.V. All rights reserved.