复合非晶丝的巨磁阻抗效应分析  

Giant Magnetoimpedance Analysis of Composite Amorphous Wire

作　　者：安康[1] 胡季帆[1] 张玲[1] 秦宏伟[1] 宋鹏[1] 

机构地区：[1]山东大学,山东济南250100

出　　处：《稀有金属材料与工程》2005年第8期1259-1262,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50271036)

摘　　要：研究了外层为NiFe层,里层为Ag丝的复合结构材料的巨磁阻抗效应,发现复合丝在较低频率下就有较大的阻抗变化值。同时推导了外场小于各向异性场时具有圆周各向异性的复合丝的阻抗表达式,并讨论了各结构参量对巨磁阻抗效应的影响。发现材料的巨磁阻抗效应强烈依赖于复合丝铁磁层的厚度;而导体层和铁磁层的电导率相差越多则材料的巨磁阻抗效应也越大。The GMI effect of composite amorphous wire consisting of Ag core and outer NiFe shell was investigated. GMI effect can be observed at low frequency. The expression of the impedance is deduced when the applied field is lower than the anisotropy field. The influence of parameters on GMI effect was theoretically analyzed. It is found that the GMI effect is strongly dependent on the thickness of ferromagnetic layer. And the GMI effect increase considerably when the conductivity of the inner core is much larger than that of the shell.

关 键 词：复合非晶丝 巨磁阻抗效应 磁导率 

分 类 号：O482.54[一般工业技术—材料科学与工程]