Anisotropic Absorption of Pure Spin Currents

被引：51
作者：
Baker, A. A. [1 ,2 ]
Figueroa, A. I. [1 ]
Love, C. J. [1 ,3 ]
Cavill, S. A. [3 ,4 ]
Hesjedal, T. [2 ,4 ]
van der Laan, G. [1 ]
机构：
[1] Diamond Light Source, Magnet Spect Grp, Didcot OX11 0DE, Oxon, England
[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
[3] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England
[4] Diamond Light Source, Didcot OX11 0DE, Oxon, England
来源：
PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 04期
基金：
英国工程与自然科学研究理事会;
关键词：
FERROMAGNETIC-RESONANCE; MAGNETIZATION DYNAMICS; TRANSFER-TORQUE; HETEROSTRUCTURES;
D O I：
10.1103/PhysRevLett.116.047201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping parameter, a, in the spin sink layer. Using lab-and synchrotron-based ferromagnetic resonance, we show that an in-plane variation of damping in a crystalline Co50Fe50 layer leads to an anisotropic a in a polycrystalline Ni81Fe19 layer. This anisotropy is suppressed above the spin diffusion length in Cr, which is found to be 8 nm, and is independent of static exchange coupling in the spin valve. These results offer a valuable insight into the transmission and absorption of spin currents, and a mechanism by which enhanced spin torques and angular control may be realized for next-generation spintronic devices.
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页数：6
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