基于锁相放大器的微扰型共面波导铁磁共振测试参量研究  

Ferromagnetic resonance measurement parameters ofperturbating coplanar waveguide using lock-in amplifier

作　　者：王涛[1] 郭牧晗 张鹏 张瀚文 冯晓玉 王奕斐 范小龙 WANG Tao;GUO Muhan;ZHANG Peng;ZHANG Hanwen;FENG Xiaoyu;WANG Yifei;FAN Xiaolong(School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学物理科学与技术学院,甘肃兰州730000

出　　处：《物理实验》2023年第2期10-19,共10页Physics Experimentation

基　　金：兰州大学中央高校基本科研业务费专项基金项目(No.lzujbky-2021-59)。

摘　　要：铁磁共振测试是自旋电子学研究的重要手段,为实现简单高效的FMR测试,基于瑞士苏黎世仪器500k MFLI锁相放大器,搭建了微扰型宽频带共面波导式铁磁共振测试系统,并对坡莫合金等材料进行了测试.为了得到材料的真实性质,对影响实验结果的参量进行优化,在深入讨论了这些参量对实验结果的影响及其物理和数学机制后,得到准确铁磁共振测试结果的实验条件为:电磁铁定点增加模式下,锁相放大器的时间常量为100 ms,滤波阶数在2阶以上,微扰线圈驱动信号振幅为1~2 V,频率为33~200 Hz.Ferromagnetic resonance(FMR)measurement is an important means of spintronics research.To realize the efficient ferromagnetic resonance testing,a perturbative broadband coplanar waveguide ferromagnetic resonance testing system was built based on the 500k MFLI lock-in amplifier of Zurich instruments in Switzerland.Based on this system,Permoly and other materials were tested.In order to obtain the real properties of the material,the parameters affecting the experimental results were optimized.After in-depth discussion of the effects of these parameters on the experimental results and their physical and mathematical mechanisms,the setting conditions for accurate measurement of FMR were given as follows.In the fixed-point increase mode of electromagnet current,the time constant of the phase-locked amplifier was 100 ms,the filtering order was above 2,the amplitude of the perturbation coil drive signal was 1~2 V,and the frequency of the perturbation signal was 33~200 Hz.

关 键 词：铁磁共振 微扰型共面波 锁相放大器 时间常量 滤波阶数 

分 类 号：O482.5[理学—固体物理]