巨磁阻抗测量系统  

GMI Measuring System

作　　者：杨介信[1] 沈国土[1] 陈国[1] 戴放文[1] 胡炳元[1] 蒋可玉[1] 

机构地区：[1]华东师范大学物理系,上海200062

出　　处：《华东师范大学学报（自然科学版）》1997年第3期44-47,共4页Journal of East China Normal University(Natural Science)

摘　　要：近年来，人们已在Co基非晶和Fe基纳米做晶材料中观察到巨阻抗效应（GMI）。当这些材料通以恒定的高频电流时，在——几十奥斯特磁场下会引起阻抗明显的变化，△Z／Z0达50％以上。预期在高灵敏磁传感器和磁记录头等方面有喜人的应用前景，因而引起各国科学家的广泛兴趣［1］。为了对该效应的机理和应用开发作进一步的研究，我们自行设计和制作了一套快速而可靠的GMI测量系统。本文重点介绍Z（H）和H的参数测试原理、操作过程和可靠性的分析。测试结果表明，该系统已经满足各类材料测定巨磁阻抗的要求。Recently, Giant Magnetic - Inpedence (GMI) has been observed in Co- based amorphousand Fe- based nanocristalline materials. When a stable high frequency current passed through thesematerials, external magnetic field intensity caned these materials to change their impedence under oneto sevral tens Oe. △Z/Z0 was greater than 50%. It eXpeCts there will be a pleased application forground in high- sensitivity magnetic sensors and magnetic record heads. aam it causes scientists of various coUntries to have broad interests. In order to research mechanism of GMI - effect and further develop applications we designed and constructed a set of fast and reliable measuring system by ourself . Inthis paper it is importantly introduced that measuring principle of parameters Z(H) and H, operationalprocess and analysing reliablity. The measuring reSults eXPlain that system has been satisfied measuring GMI demands for vacrious materials.

关 键 词：巨磁阻抗 磁阻 测量系统 纳米微晶 磁传感器 

分 类 号：TM936.6[电气工程—电力电子与电力传动]