Giant magnetoimpedance effect in soft magnetic wires for sensor applications

被引:182
作者
Vazquez, M
Knobel, M
Sanchez, ML
Valenzuela, R
Zhukov, AP
机构
[1] CSIC,INST CIENCIA MAT,LAS ROZAS,MADRID,SPAIN
[2] UNICAMP,LMBT,DFESCM,IFGW,BR-13083970 CAMPINAS,SP,BRAZIL
[3] UNIV OVIEDO,DEPT FIS,E-33007 OVIEDO,SPAIN
[4] NATL AUTONOMOUS UNIV MEXICO,INST MAT,MEXICO CITY 04510,DF,MEXICO
[5] CHERNOGOLOVKA SOLID STATE PHYS INST,CHERNOGOLOVKA 142432,MOSCOW DISTRICT,RUSSIA
关键词
soft magnetic materials; amorphous wires; magnetic sensors;
D O I
10.1016/S0924-4247(97)80143-4
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The giant magneto-impedance effect (GMI) consists of the large relative change of the impedance (up to around 300%) observed in magnetically very soft ribbon and wire alloys under the application of de magnetic fields (units of kA m(-1)), The phenomenology of the GMI effect is firstly described including a discussion about its origin which mainly lies in the classical skin-effect. An alternative approach to GMI phenomena considering equivalent circuits is also introduced. The main requirements to detect GMI is to count on a sample with very large circular susceptibility and reduced resistivity provided the frequency of the ac current flowing along the sample (necessary to evaluate the impedance) is high enough (roughly above 0.1 MHz for most samples here considered). The dependence on de magnetic field, mechanical stresses and particularly on thermal treatments resulting in the induced magnetic anisotropies or in the devitrification of amorphous samples into a nanocrystalline structure are reviewed. First results on GMI in glass-coated amorphous microwires are also reported. The use of the GMI as a tool for studying the inner circular magnetization process or for evaluating the magnetostriction is introduced. Finally, a description on various aspects regarding the development of magnetic field, current, proximity and stress sensor applications is presented. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:20 / 29
页数:10
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