Transactions of the Magnetics Society of Japan
Online ISSN : 1884-6726
Print ISSN : 1346-7948
ISSN-L : 1346-7948
Giant Magneto-Impedance Measurements at High Frequency in Planar Samples
A. Garcia-ArribasD. de CosJ. M. Barandiaran
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2005 Volume 5 Issue 4 Pages 152-156

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Abstract

Impedance measurements as a function of the applied magnetic field are performed at high frequency using an experimental set-up specially adapted for planar samples, which is based on a microstrip transmission line. Microwave measurement techniques and a consistent data reduction procedure allow obtaining very detailed and accurate impedance measurements. The results for two different samples, an amorphous ribbon and a trilayer thin film, reveal the importance of the ferromagnetic resonance contribution at high frequency. Besides, fine details of the magneto-impedance behavior at low field confirm that it is mainly governed by magnetization processes. At high frequency, when the ferromagnetic resonance contribution at low field weakens, an impedance peak re-appears, that seems to be related with the usual peak that exists at low frequency.

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