Abstract

Microstructural (X-ray diffraction), magnetic properties (hysteresis loop), electrical resistivity, magneto-impedance and stress impedance effects have been investigated in cold-drawn Fe77.5B15Si7.5 amorphous wire. Initial amorphous wire (obtained by the in-rotating-water technique) with diameter of 125 mu m was submitted to cold-drawn process decreasing the diameter to 50 pm. Such cold-drawn wire was treated by current annealing (currents of 190, 210, 220 and 230 mA during times between I and 45 min) for tailoring the magnetic and electrical transport properties. A qualitative analysis of the magnetoimpedance and stress impedance effects is given by considering the influence of the magnetoclastic anisotropy and frequency of the AC driving electrical current on the circular permeability. (c) 2005 Elsevier B.V. All rights reserved.