Table of Contents
Textures and Microstructures
Volume 32, Issue 1-4, Pages 269-279

Influence of Various Heat Treatments on Giant Magnetoimpedance Effect in Nanocrystalline FeSiBNbCu Ribbons

1Instituto de Magnetismo Aplicado RENFE-UCM, Instituto de Ciencia de Materiales, CSIC, P.O. Box 155, Madrid, Las Rozas 28230, Spain
2Institute of Metal Physics UD RAS, Kovalevskaya str. 18, GSP-170, Ekaterinburg 620219, Russia
3Institute of Solid State Physics RAS, Moscow, Chernogolovka 142432, Russia
4Departamento de Fisica de Materiales, Universidad de Pais Basco, San Sebestain 20007, Spain

Accepted 28 September 1997

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this paper we present studies on the frequency dependence of the magneto-impedance in the range of 0.1–2 MHz for Fe73.5Si13.5B9Nb3Cu1 and Fe73.5Si16.5B6Nb3Cu1 nanocrystalline ribbons, which differ in the sign of the magnetostriction constant. As cast samples were annealed in Ar atmosphere at 560℃, with and without an DC and AC magnetic field. At a fixed frequency, an improvement in the field annealed 13.5% Si samples, when compared with the zero field annealed ones, can be observed. On the 16.5% Si field annealed samples only a reduction of magneto-impedance ratio could be observed, when compared to the non-field annealed ones. Analysis of the magnetic properties and X-ray data shows that the observed changes in magneto-impedance effect are consequence of the induced magnetic anisotropy.