MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Sample Length Dependence of Giant Magnetoimpedance in FeCuNbSiB Nanocrystalline Ribbons
Ma ZhaoShaoming FangZhouxiang HanJianying WeiHui PengLinfu Chen
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2007 Volume 48 Issue 3 Pages 460-464

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Abstract

In this work the sample length dependence of giant magnetoimpedance for Fe73.5Cu1Nb3Si13.5B9 nanocrystalline ribbons was investigated. The longitudinal magnetoimpedance ΔZZ0 for Fe73.5Cu1Nb3Si13.5B9 nanocrystalline ribbons decreases with the decreasing of sample length L due to the demagnetization effects. The demagnetization field lowers the permeability, especially for the very shorter sample. The magnetoimpedance ΔZZ0 experiences a peak under a field Hp due to the existence of transverse anisotropy. Different from the saturation behavior of Hp at high frequencies for longer sample with L=40 mm, there is a maximum phenomenon of peak field HP at about 700∼900 kHz for shorter sample with L=13 mm. With increasing ac frequency, the peak-magnetoimpedance (ΔZZ0)p also experiences a maximum value for both longer and shorter samples. The maximum peak-magnetoimpedance [(ΔZZ0)p]max shifts to lower frequency with reduction of sample length.

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© 2007 The Japan Institute of Metals and Materials
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