Giant magnetoimpedance effect in amorphous Co-Mn-Si-B microwire

Giant magnetoimpedance (GMI) effect has been observed in glass-coated amorp hous Co83.2Mn7.6Si5.8B3.3 microwire. The magnetoimpedance (MI) of this samp le has been studied up to a frequency of 11 MHz and varying a dc magnetic f ield (H-dc) within +/- 140 Oe. A maximum change of 53% in MI has been obser ved around a frequency of 4 MHz. The application of an external stress chan ges the MI results to a large extent. The magnetization of the same sample has also been measured in the presence of different tensile stresses to und erstand the domain structure and magnetoimpedance results. (C) 2001 Elsevie r Science BY All rights reserved.