Drag effect induced large anisotropic damping behavior in magnetic thin films with strong magnetic anisotropy
Drag effect induced large anisotropic damping behavior in magnetic thin films with strong magnetic anisotropy
复制标题
强磁各向异性磁性薄膜中的阻力效应引起的大各向异性阻尼行为
DOI：
10.1088/1361-648x/abe265
复制
发表时间：
2021-04-28
影响因子：
2.7
通讯作者：
Cheng, Zhao-hua
中科院分区：
文献类型：
--
作者：
Li, Yang;Li, Yan;Cheng, Zhao-hua
固有吉尔伯特阻尼的确定是自旋电子学领域的核心兴趣之一。然而，磁性薄膜中的一些外部因素往往在磁化动力学中发挥显着的作用。在这里，我们通过铁磁共振技术对具有各种面内磁各向异性的铁磁薄膜中的磁弛豫进行了全面研究。我们发现，磁拖曳效应会导致谐振线宽展宽以及由于场磁化失准而导致线宽对频率的非线性依赖性。结果，这可能导致关键动态参数吉尔伯特阻尼的提取不精确，并导致高磁各向异性薄膜和多层中超低和各向异性阻尼的混乱行为。我们的结果为自旋电子学测量中吉尔伯特阻尼的准确定量估计提供了重要方法。
The determination of intrinsic Gilbert damping is one of the central interests in the field of spintronics. However, some external factors in magnetic films tend to play a remarkable role in the magnetization dynamics. Here, we present a comprehensive study of the magnetic relaxation in ferromagnetic films with various in-plane magnetic anisotropy via ferromagnetic resonance technique. We find that the magnetic drag effect can result in the resonant linewidth broadening and the nonlinear dependence of linewidth on frequency stemming from field-magnetization misalignment. As a result, this could lead to the imprecise extraction of the key dynamic parameter-Gilbert damping and cause the confusing behaviors of ultra-low and anisotropic damping in thin films and multi-layers with high magnetic anisotropy. Our results provide a crucial way for the accurately quantitative estimation of the Gilbert damping in spintronics measurements.