Nearly isotropic spin-pumping related Gilbert damping in Pt/Ni81Fe19/Pt

被引：9
|
作者：
Cao, W. [1 ]
Yang, L. [1 ]
Auffret, S. [2 ]
Bailey, W. E. [1 ,2 ]
机构：
[1] Columbia Univ, Dept Appl Phys & Appl Math, Mat Sci & Engn, New York, NY 10027 USA
[2] Univ Grenoble Alpes, SPINTEC, CEA, CNRS, F-38000 Grenoble, France
来源：
PHYSICAL REVIEW B | 2019年 / 99卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.99.094406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A recent theory by Chen and Zhang [Phys. Rev. Lett. 114, 126602 (2015)] predicts strongly anisotropic damping due to interfacial spin-orbit coupling in ultrathin magnetic films. Interfacial Gilbert-type relaxation, due to the spin pumping effect, is predicted to be significantly larger for magnetization oriented parallel to compared with perpendicular to the film plane. Here, we have measured the anisotropy in the Pt/Ni81Fe19/Pt system via variable-frequency, swept-field ferromagnetic resonance (FMR). We find a very small anisotropy of enhanced Gilbert damping with sign opposite to the prediction from the Rashba effect at the FM/Pt interface. The results are contrary to the predicted anisotropy and suggest that a mechanism separate from Rashba spin-orbit coupling causes the rapid onset of spin-current absorption in Pt.
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页数：4
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