Highly accurate evaluation of spin-torque efficiency by measuring in-plane angular dependence of spin-torque ferromagnetic resonance
Highly accurate evaluation of spin-torque efficiency by measuring in-plane angular dependence of spin-torque ferromagnetic resonance
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DOI：
10.1016/j.jmmm.2020.166727
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发表时间：
2020-07
影响因子：
2.7
通讯作者：
Taisuke Horaguchi;M. Matsuo;Y. Nozaki
中科院分区：
文献类型：
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作者：
Taisuke Horaguchi;M. Matsuo;Y. Nozaki
自旋矩铁磁共振（ST-FMR）是研究自旋矩效率（ST-FMR）的有力工具。ST-FMR是由铁磁和非铁磁材料组成的双层金属膜中电流感生的自旋矩效率。通常，可以从ST-FMR谱的对称分量和反对称分量之间的幅度比来评估ST-FMR。然而，由于用于激励ST-FMR的不对称交流电流，该比率还受到不必要的磁场的影响。在这篇文章中，我们证明，即使交流电流的分布是高度不对称的，ST-FMR谱的全角度依赖性，可以精确地评估ST-FMR。
Spin-torque ferromagnetic resonance (ST-FMR) is a powerful tool to evaluate spin-torque efficiency (ξ FMR), the efficiency of current-induced torque in metallic bilayers consisting of ferromagnetic and nonmagnetic materials. In general, ξ FMR can be evaluated from the amplitude ratio between symmetric and anti-symmetric components of the ST-FMR spectrum. However, the ratio is also affected by an unnecessary magnetic field owing to the asymmetric alternating current flow used to excite the ST-FMR. In this article, we demonstrate that ξ FMR can be precisely evaluated from the full-angular dependence of the ST-FMR spectrum even though the distribution of alternating current flow is highly asymmetric.