| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Broad-Band FMR Linewidth of Co2MnSi Thin Films with Low Damping Factor: The Role of Two-Magnon Scattering |
| Shi-Zhu Qiao1,2**, Quan-Nian Ren1, Run-Run Hao2, Hai Zhong2, Yun Kang2, Shi-Shou Kang2, Yu-Feng Qin3**, Shu-Yun Yu2, Guang-Bing Han2, Shi-Shen Yan2, Liang-Mo Mei2 |
1Department of Science, Taiyuan Institute of Technology, Taiyuan 030008
2School of Physics, Shandong University, Jinan 250100
3Department of Applied Physics, School of Information Science and Engineering, Shandong Agricultural University, Taian 271018 |
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Shi-Zhu Qiao, Quan-Nian Ren, Run-Run Hao et al 2016 Chin. Phys. Lett. 33 047601 |
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Abstract The low Gilbert damping factor, which is usually measured by ferromagnetic resonance, is crucial in spintronic applications. Two-magnon scattering occurs when the orthogonality 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.
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Received: 10 October 2015
Published: 29 April 2016
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| PACS: |
76.50.+g
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(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
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75.70.Ak
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(Magnetic properties of monolayers and thin films)
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75.40.Gb
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(Dynamic properties?)
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