GMI measurements in ribbons of Co sub 70.4 Fe sub 4.6 Si sub 15 B sub 10 in a wide range of frequencies

This paper reports room-temperature giant magnetoimpedance (GMI) data, measured in samples made of pieces of ribbons of amorphous Co sub 70.4 Fe sub 4.6 Si sub 15 B sub 10 in the microwave frequency range (f=2-12 GHz), for magnetic fields H up to 0.2T. The measurements were carried out using the sam...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2000-08, Vol.226-230, p.724-726
Main Authors: Machado, F L A, De Araujo, A E P, De Aguiar, F M, Rezende, S M
Format: Article
Language:English
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Summary:This paper reports room-temperature giant magnetoimpedance (GMI) data, measured in samples made of pieces of ribbons of amorphous Co sub 70.4 Fe sub 4.6 Si sub 15 B sub 10 in the microwave frequency range (f=2-12 GHz), for magnetic fields H up to 0.2T. The measurements were carried out using the samples as one of the conductors of a microstrip line terminated by a short and connected to a network analyzer. We found that values of H, corresponding to the position of the peaks in the impedance spectrum and the peak widths, increase with f. Both the f- and H-dependence of the GMI are in good agreement with a theoretical model based on the dynamics of the domain walls at low f and on the ferromagnetic resonance at high f.
ISSN:0304-8853