各向异性场对三明治膜巨磁阻抗效应的影响  

The magnetic anisotropic effect on giant magnetoimpedance in sandwiched films

作　　者：王艾玲[1] 刘江涛[1] 周云松[1] 姜宏伟[1] 郑鹉[1] 

机构地区：[1]首都师范大学物理系,北京100037

出　　处：《物理学报》2004年第3期905-910,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :5 0 0 710 3 8);北京市教育委员会基金资助的课题

摘　　要：根据具有巨磁阻抗 (GMI)效应的实际三明治样品的状况 ,提出三明治结构作为理论计算的模型 ,考虑了磁性层的各向异性场 ,利用一定边界条件下的Maxwell方程和Landau_Lifshitz方程对模型进行了理论计算 ,得到了阻抗与频率、各向异性场等因素间的函数关系 .在此基础上 ,着重讨论了各向异性场Hk 的作用 .Hk 的大小、方向均会对GMI效应造成影响 ,最佳的Hk 应在 4 0 0A m左右 ,位于面内并与电流垂直 .The sandwiched film structured by two soft magnetic layers with the Cu layer as the central one is proposed,which is based on the experimental samples of giant magnetoimpedance (GMI) effect.Its characteristics are discussed theoretically using Maxwell equations and Landau-Lifshitz equation wiuh calculating the anisotropy of the magnetic layers.Application of the theoretical model to real materials is examined.Predictions of the model compare well qualitatively with experimental data.The anisotropic constant H k of the magnetic layer is very important.The GMI effect is modified by both the magnitude and the orientation of H k.The best H k is about 400A/m along the normal to the current.It is also proved that any magnetostriction in the magnetic layer of the sandwiched film damages the GMI effect.

关 键 词：巨磁阻抗效应 三明治膜 各向异性场 Landau—Lifshitz方程 MAXWELL方程 磁致伸缩 

分 类 号：O482[理学—固体物理]