Broad-Band FMR Linewidth of Co_2MnSi Thin Films with Low Damping Factor:The Role of Two-Magnon Scattering  

作　　者：乔士柱 任全年 郝润润 钟海 康韵 康仕寿 秦羽丰 于淑云 韩广兵 颜世申 梅良模 

机构地区：[1]Department of Science,Taiyuan Institute of Technology [2]School of Physics,Shandong University [3]Department of Applied Physics,School of Information Science and Engineering,Shandong Agricultural University

出　　处：《Chinese Physics Letters》2016年第4期130-133,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant No 2015CB921502;the National Natural Science Foundation of China under Grant Nos 11474184 and 11174183;the Program for New Century Excellent Talents of China under Grant No NCET-10-0541;the Scientific Research Foundation for Returned Overseas Chinese Scholars under Grant No B13029;the Natural Science Foundation of Shandong Province under Grant No JQ201201;the Doctorate Foundation of Shandong Province under Grant No BS2013CL042;the Young Scientists Fund of the National Natural Science Foundation of China under Grant No 11204164

摘　　要：The low Gilbert damping factor, which is usually measured by ferromagnetic resonance, is crucial in spintronic applications. Two-magnon scattering occurs when the orthogonMity of the ferromagnetic resonance mode and other degenerate spin wave modes was broken by magnetic anisotropy, voids, second phase, surface defects, etc., which is important in analysis of ferromagnetic resonance linewidth. Direct fitting to linewidth with Gilbert damping is advisable only when the measured linewidth is a linear function of measuring frequency in a broad band measurement. We observe the nonlinear ferromagnetic resonance linewidth of Co2MnSi thin films with respect to measuring frequency in broad band measurement. Experimental data could be well fitted with the model including two-magnon scattering with no fixed parameters. The fitting results show that two-magnon scattering results in the nonlinear linewidth behavior, and the Gilbert damping factor is much smaller than reported ones, indicating that our Co2MnSi films are more suitable for the applications of spin transfer torque.The low Gilbert damping factor, which is usually measured by ferromagnetic resonance, is crucial in spintronic applications. Two-magnon scattering occurs when the orthogonMity of the ferromagnetic resonance mode and other degenerate spin wave modes was broken by magnetic anisotropy, voids, second phase, surface defects, etc., which is important in analysis of ferromagnetic resonance linewidth. Direct fitting to linewidth with Gilbert damping is advisable only when the measured linewidth is a linear function of measuring frequency in a broad band measurement. We observe the nonlinear ferromagnetic resonance linewidth of Co2MnSi thin films with respect to measuring frequency in broad band measurement. Experimental data could be well fitted with the model including two-magnon scattering with no fixed parameters. The fitting results show that two-magnon scattering results in the nonlinear linewidth behavior, and the Gilbert damping factor is much smaller than reported ones, indicating that our Co2MnSi films are more suitable for the applications of spin transfer torque.

关 键 词：of it FMR in is Broad-Band FMR Linewidth of Co2MnSi Thin Films with Low Damping Factor:The Role of Two-Magnon Scattering with 

分 类 号：O484.4[理学—固体物理]