Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle
Time-domain detection of current controlled magnetization damping in Pt/Ni81Fe19 bilayer and determination of Pt spin Hall angle
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DOI：
10.1063/1.4896277
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发表时间：
2014-09-15
影响因子：
4
通讯作者：
Barman, A.
中科院分区：
文献类型：
--
作者：
Ganguly, A.;Rowan-Robinson, R. M.;Barman, A.
利用时间分辨磁光克尔显微镜研究了Pt/Ni81Fe19矩形双层膜中自旋霍尔效应对自旋力矩的影响。由于Pt注入Ni81Fe19的自旋电流，电流通过堆叠导致有效阻尼的线性变化高达+/- 7%。Pt的自旋霍尔角为0.11 +/- 0.03。阻尼的调制取决于电流与偏置磁场之间的夹角。这些结果证明了光学检测进动磁化动力学对于研究自旋霍尔效应引起的自旋传递力矩的重要性。(C) 2014 AIP出版有限责任公司
The effect of spin torque from the spin Hall effect in Pt/Ni81Fe19 rectangular bilayer film was investigated using time-resolved magneto-optical Kerr microscopy. Current flow through the stack resulted in a linear variation of effective damping up to +/- 7%, attributed to spin current injection from the Pt into the Ni81Fe19. The spin Hall angle of Pt was estimated as 0.11 +/- 0.03. The modulation of the damping depended on the angle between the current and the bias magnetic field. These results demonstrate the importance of optical detection of precessional magnetization dynamics for studying spin transfer torque due to spin Hall effect. (C) 2014 AIP Publishing LLC.