玻璃包覆钴基非晶丝巨磁阻抗效应(英文)  

Giant magneto-impedance of glass-covered Co-rich amorphous wires

作　　者：田斌[1,2] 江建军[1] 马强[1] 梁培[1] 杜刚[1] 何华辉[1] 

机构地区：[1]华中科技大学电子科学与技术系,武汉430074 [2]武汉工程大学电气信息学院,武汉430074

出　　处：《功能材料与器件学报》2009年第1期87-91,共5页Journal of Functional Materials and Devices

基　　金：Natural Science Foundation of China(No.50371029);New Century Excellent Talents in University(No.NCET-04-0702);Elitist in Natural Science Foundation of Hubei Province(No.2005ABB002)

摘　　要：本文讨论了长度对玻璃包覆钴基非晶丝巨磁阻抗效应的影响。通过测量不同频率下（0．1-1MHz）以及不同长度样品的巨磁阻抗效应，结果表明，长度对玻璃包覆钴基非晶丝巨磁阻抗效应有显著影响。通过计算样品的环向磁导率，发现样品的磁畴结构和饱和磁化后的退磁场影响着环向磁导率变化大小。没有加入恒定磁场时，特殊的磁畴结构决定了不同长度样品的环向磁导率近似相等。饱和磁化后，较长的样品的环向磁导率较小，其环向磁导率的变化较大，从而导致相应的巨磁阻抗效应增强。The length effect on giant magneto- impedance in glass- covered Co- rich amorphous wires were studied in this paper. The measurements of the magneto - impedance of the samples with different length and the driver current frequency （from 100 KHz to 1 MHz） were carried out. It was found that the variation of GMI of the longer sample was more evident. The circular permeability was further calculated. The study of the circular permeability indicates that GMI effect is influenced by the domain and demagnetization energy after longitudinal saturated magnetization. Without dc field, the circular permeability of sam- ples is approximate equality and this phenomenon was explained by the core - shell model. After longitudinal saturated magnetization,the circular permeability of the longer sample is smaller for the demagnetization energy effect. Thus, the variation of the circular permeability becomes more severe for the longer sample. The conclusions will deepen the understanding of GMI effect.

关 键 词：巨磁阻抗 磁畴 退磁场 

分 类 号：TB383[一般工业技术—材料科学与工程]