Abstract

We report on fabrication, structural and magnetic characterization Of Cu-70(Co70Fe5Si10B15)(30) microwires with total diameter of 28.2 mu m and metallic nucleus diameter of 15.2 mu m produced by the Taylor-Ulitovski method containing 30% of alloy composition commonly used amorphous soft magnetic material and 70% Cu. The structure consists of crystalline Cu, and mixture of ferromagnetic phases. The as-prepared Cu-70(Co70Fe5Si10B15)(30) microwires present coercivity of about 85 Oe at room temperature. Temperature dependence of coercivity is measured. Significant increase of coercivity till 135 Oe is observed at about 50 K Magnetization measured under applied magnetic field (FC) and without magnetic field (ZFC) exhibit significant difference attributed to the inhomogeneity of as-prepared samples consisting of crystalline paramagnetic Cu matrix with ferromagnetic entities. MR related with existence of ferromagnetic grains in paramagnetic Cu matrix has been observed. This MR increases with decreasing temperature (up to 1.6% at 5 K). (C) 2008 Elsevier B.V. All rights reserved.