Correlation between magnetization processes and giant magnetoimpedance response in CoFeBSi amorphous CoFeBSi wires

Citation
Kl. Garcia et R. Valenzuela, Correlation between magnetization processes and giant magnetoimpedance response in CoFeBSi amorphous CoFeBSi wires, J NON-CRYST, 287(1-3), 2001, pp. 313-317
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF NON-CRYSTALLINE SOLIDS
ISSN journal
00223093 → ACNP
Volume
287
Issue
1-3
Year of publication
2001
Pages
313 - 317
Database
ISI
SICI code
0022-3093(200107)287:1-3<313:CBMPAG>2.0.ZU;2-3
Abstract
Giant magnetoimpedance (GMI) in amorphous (Fe0.06Co0.94)(72.5) B15Si12.5 wi res (submitted to an alternative current, i(ac)) has a dependence of the im pedance response, Z, on direct current magnetic field, H-dc. In as-cast wir es, the ac current frequency changes the GMI: for frequencies of a few kHz, the impedance response is a function of H-dc, having a single maximum at H -dc = 0; for frequencies >1 MHz, however, two maxima (with a minimum at H-d c = 0) are observed. By analyzing the frequency dependence of real, L-r, an d imaginary inductance, L-i (proportional to real and imaginary permeabilit y, respectively), we show that these results can be explained in terms of t he dominant magnetization process: domain wall bulging for low frequencies, and magnetization rotation for high frequencies. Plots of both L-r and L-i as a function of frequency indicate relaxation processes at about 45 kHz, due to a change from domain wall to spin rotation as the dominant magnetiza tion process. (C) 2001 Elsevier Science B.V. All rights reserved.