Temperature dependences of magnetoimpedance of nanocrystalline fe-based ribbons

Abstract

The influence of a magnetic field or the mechanical stresses on the impedance of the Fe 73.5Si 16.5B 6Nb 3Cu 1 and Fe 73.5Si 13.5B 9Nb3Cu 1 ribbons was investigated in the (297/433) K temperature range. It is shown that impedance changes, which are observed under the application of mechanical stresses and temperature, are conditioned by the structural features and magnetic properties of the alloys. The temperature increase leads to a decrease of the saturation magnetostriction constant, an increase of the anisotropy axis dispersion and a decrease of the anisotropy effective value. It was determined that the maximum sensitivity of impedance to the mechanical stresses reaches the value of about 2%/MPa for the Fe 73.5Si 16.5B 6Nb 3Cu 1 and Fe 73.5Si 13.5B 9Nb 3Cu 1 samples. Copyright © 2012 American Scientific Publishers All rights reserved.