柔性磁致伸缩FeGa薄膜中磁光克尔效应的应力调控  

Strain Tunable Magneto-Optical Kerr Effect in Flexible Magnetostrictive FeGa Films

作　　者：代国红[1] 许艺铧 沈云 韩道福 邓晓华 DAI Guohong;XU Yihua;SHEN Yun;HAN Daofu;DENG Xiaohua(School of Science,Nanchang University,Nanchang 330031,China;Institute for Advanced Study,Nanchang University,Nanchang 330031,China;Institute of Space Science and Technology,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学理学院,南昌330031 [2]南昌大学高等研究院,南昌330031 [3]南昌大学空间科学与技术研究院,南昌330031

出　　处：《实验室研究与探索》2021年第11期20-22,26,共4页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(61504052);江西省自然科学基金项目(20161BAB211006);江西省高等学校教学改革研究省级教改课题项目(JXJG-16-1-24);教育部第二批新工科研究与实践项目(ESXWLHXLX2020605)。

摘　　要：针对柔性磁致伸缩薄膜样品,搭建了应力拉伸机械装置,提出一种通过改变磁致伸缩FeGa薄膜的应力状态调控表面磁光克尔效应的方法。首先,从磁光克尔的基本原理出发,推导出克尔转角的表达式,利用自主设计的机械拉伸装置对柔性磁致伸缩FeGa薄膜施加应力,测量不同应力状态下FeGa薄膜的磁光克尔信号,研究张应力对磁光克尔效应的调控规律。最后根据所得的克尔曲线计算出磁滞回线的矩形比,并得到不同磁化轴方向张应力对磁光克尔信号的调控规律。In this paper,we propose a convenient method to adjust the surface magneto-optical Kerr signal by changing the stress state of the flexible magnetostrictive FeGa film.Firstly,we theoretically investigate the adjusting process of the Kerr signal.Next,the magneto-optical Kerr signals of FeGa film under different stress states are measured using MOKE combined with a self-designed mechanical stretching device.Finally,the squareness ratio of Kerr hysteresis loops is calculated.We systematically investigate the effect of the tensile stress on the magneto-optical Kerr signal in different magnetization axis directions.

关 键 词：磁光克尔效应 应力调控 磁致伸缩 柔性 

分 类 号：O436.4[机械工程—光学工程]