"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

ANALYSIS OF THE FREQUENCY DEPENDENCE OF THE MAGNETOIMPEDANCE IN CURRENT ANNEALED AMORPHOUS WIRES

V. Raposo1,* , D. García1, O. Montero1, A. G. Flores1, J. I. Iñiguez1

Affiliation

  1. Dpto. Física Aplicada, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca, Spain

Abstract

Magnetoimpedance in amorphous wires in their as-cast and after current annealing has been measured in the range from 0.1 to 30 MHz. In Fe rich wires there is an increase of the magnetoimpedance ratio with annealing until full crystallization of the sample. Analysis of both the hysteresis loops and the real and imaginary parts of the impedance shows the induction of circular permeability in the samples. The behavior of the impedance of the sample can be reproduced by a modified core-shell model which takes into account the magnetic losses in the wire. When plotting the phase angle of the complex impedance, the difference between the classical and modified model becomes apparent. Experimental measurements show a maximum of the phase angle caused by the combination of the existence of two different permeabilities in the core and the shell and the magnetic losses that exist within the wire. There are also other smaller peaks in the phase angle in the measured range caused by three resonances of magnetoelastic nature. Similar behavior is present in as-cast Co based wires with vanishing magnetostriction which presents very high values of the circular permeability in the external shell but no resonant peaks..

Keywords

Amorphous wires, Giant magnetoimpedance, Complex impedance phase angle, Permeability, Magnetic losses, Resonance.

Submitted at: April 26, 2004
Accepted at: June 10, 2004

Citation

V. Raposo, D. García, O. Montero, A. G. Flores, J. I. Iñiguez, ANALYSIS OF THE FREQUENCY DEPENDENCE OF THE MAGNETOIMPEDANCE IN CURRENT ANNEALED AMORPHOUS WIRES, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 2, pp. 575-580 (2004)