基于矢量磁光克尔效应测试的外延磁性薄膜磁化翻转与反磁化机制研究  

Mechanism of magnetization switching and reversal in epitaxial magnetic films based on vector magneto-optic Kerr effect

作　　者：冯心薇 张慧[1] 薛珂磊 詹清峰 FENG Xin-wei;ZHANG Hui;XUE Ke-lei;ZHAN Qing-feng(School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学物理与电子科学学院,上海200241

出　　处：《物理实验》2021年第12期1-12,共12页Physics Experimentation

摘　　要：利用磁光克尔效应测试磁性薄膜的磁滞回线,是研究磁性薄膜表面磁性的重要方法.利用矢量磁光克尔效应测试磁化矢量的纵向和横向分量,研究外延磁性薄膜和交换偏置异质结的磁化翻转路径.获得了磁光克尔效应测试磁化翻转场的角度依赖关系,结合畴壁形核与位移模型进行拟合,提出了外延磁性薄膜与异质结中连续和分立发生的90°畴壁形核反磁化机制.The hysteresis loops of magnetic films can be measured based on the magneto-optic Kerr effect(MOKE)magnetometry,which is an important method for studying the surface magnetism of magnetic films.We have used the vector MOKE magnetometry to obtain the longitudinal and transverse components of the magnetization vector,and studied the magnetization reversal routes of the epitaxial magnetic films and exchange bias heterojunctions.The angle dependence of magnetization reversal field measured by MOKE was obtained.Combined with the fitting of domain wall nucleation and displacement model,the mechanism of 90°domain wall nucleation reversal magnetization in epitaxial magnetic films and heterojunctions was proposed.

关 键 词：外延磁性薄膜 磁光克尔效应 交换偏置效应 畴壁形核与位移模型 磁各向异性 

分 类 号：O484.4[理学—固体物理] TM271[理学—物理]