Broad-Band FMR Linewidth of Co2MnSi Thin Films with Low Damping Factor： The Role of Two-Magnon Scattering

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 ph...

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Published in中国物理快报：英文版 no. 4; pp. 130 - 133
Main Author 乔士柱 任全年 郝润润 钟海 康韵 康仕寿 于淑云 韩广兵 颜世申 梅良模 秦羽丰
Format Journal Article
LanguageEnglish
Published 01.04.2016
Subjects
宽带
散射
测量频率
磁振子
自旋转移
薄膜
铁磁共振线宽
阻尼因子
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/33/4/047601

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Summary: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.
Bibliography:Shi-Zhu Qiao, Quan-Nian Ren, Run-Run Hao, Hai Zhong, Yun Kang, Shi-Shou Kang, Yu-Feng Qin, Shu-Yun Yu, Guang-Bing Han, Shi-Shen Yan, Liang-Mo Mei 1Department of Science, Taiyuan Institute of Technology, Taiyuan 030008 2School of Physics, Shandong University, Jinan 250100 of Applied Physics, School of Information Science and Engineering Shandong Agricultural University, Taian 271018
11-1959/O4
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.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/33/4/047601