arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1804.00554cond-mat.mtrl-sci
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钙钛矿型La $_{0.7}$ Sr $_{0.3}$ MnO $_{3}$薄膜的各向异性吉尔伯特阻尼

Anisotropic Gilbert damping in perovskite La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ thin film

Qing Qin, Shikun He, Haijun Wu, Ping Yang, Liang Liu, Wendong Song, Stephen John Pennycook, Jingsheng Chen

摘要:

控制磁化动力学的粘性吉尔伯特阻尼参数对于各种自旋电子学应用是至关重要的。尽管理论上认为阻尼常数是各向异性的。由于缺乏实验证据,它通常被视为标量。在这里,我们提出了一个详细的角度依赖宽带铁磁共振研究高品质的外延La $_{0.7}$ Sr $_{0.3}$ MnO $_{3}$薄膜。外在的影响被抑制,我们表现出令人信服的证据,在室温下具有双重对称性的各向异性阻尼。观察到的各向异性弛豫归因于能带结构的磁化取向依赖性。此外,我们证明了这种各向异性可以通过操纵染色来定制。这项工作为理解磁化弛豫机制提供了新的见解。

英文摘要:

The viscous Gilbert damping parameter governing magnetization dynamics is of primary importance for various spintronics applications. Although, the damping constant is believed to be anisotropic by theories. It is commonly treated as a scalar due to lack of experimental evidence. Here, we present an elaborate angle dependent broadband ferromagnetic resonance study of high quality epitaxial La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ films. Extrinsic effects are suppressed and we show convincing evidence of anisotropic damping with twofold symmetry at room temperature. The observed anisotropic relaxation is attributed to the magnetization orientation dependence of the band structure. In addition, we demonstrated that such anisotropy can be tailored by manipulating the stain. This work provides new insights to understand the mechanism of magnetization relaxation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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