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Frequency dependence of magnetization and giant magneto impedance effect of amorphous wires

International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 375-378页

作者： Shu-ling Zhang Jian-fei Sun Da-wei Xing Da-qing Fang Lu-cai Wang School of Materials Science and Engineering Taiyuan University of Science and Technology School of Materials Science and Engineering Harbin Institute of Technology

The frequency dependence of magnetization process and giant magneto impedance （GMI） effect of Co-rich melt-extracted amorphous wires was studied by Kerr effect and impedance analyzer, respectively. It is demonstrated that the transverse Kerr intensity and the corresponding GMI response increase with increasing frequency, which contributes to the upgraded skin effect. However, the skin depth has a slothful trend with frequency when it is up to the megahertz range, which gives rise to the transformation of magnetization. The process is much more sensitive to the direct current magnetic field and the sensitive change of the circular permeability, and GMI response is observed as its consequence. This proves that the evolution of circumferential magnetization and the corresponding permeability with the direct current magnetic field is the essence of GMI response, and a much more sensitive magnetization promises a better GMI response.

关键词： amorphous wires magnetization giant magneto impedance Kerr magneto-optical effect melt extraction

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Effect of glass removal on the GMI effect of Co_(71.8)Fe_(4.9)Nb_(0.8)Si_(7.5)B_(15) amorphous glass-covered wires

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Rare Metals 2006年第Z1期25卷 633-636页

作者： CHEN Zheng BA Shan LI Deren LU Zhichao ZHOU Shaoxiong Central Iron & Steel Research Institute Nanomaterials Engineering and Research Center Beijing 100081 China Research and Development Center Advanced Technology & Materials Co. Ltd. Beijing 100081 China Beijing Institute of Technology School of Science Beijing 100081 China Central Iron & Steel Research Institute Nanomaterials Engineering and Research Center Beijing 100081 China Research and Development Center Advanced Technology & Materials Co. Ltd. Beijing 100081 China Central Iron & Steel Research Institute Nanomaterials Engineering and Research Center Beijing 100081 China Research and Development Center Advanced Technology & Materials Co. Ltd. Beijing 100081 China

During the past several years, giant magneto-impedance effect (GMI) in amorphous wires has generated growing interest in the science community because of their applications in sensors. The giant magneto-impedance effect in Co71.8Fe4.9Nb0.8Si7.5B15 amorphous glass-covered wires (AGCW) consists of strong changes in the high frequency impedance with a small DC magnetic field. When f=1 MHz, there is no GMI effect due to the fact that the magnetic penetration depth is higher than their radius. As the frequency increases, the GMI effect becomes important in both the glass-covered wire and the wire after glass removal. Field dependence of the impedance has a similar behaviour to the AGCW ones, when a tensile stress is applied to the wire without glass cover.

关键词： giant magneto-impedance amorphous wires frequency

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