Detection and quantification of inverse spin Hall effect from spin pumping in permalloy/normal metal bilayers
Detection and quantification of inverse spin Hall effect from spin pumping in permalloy/normal metal bilayers
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DOI：
10.1103/physrevb.82.214403
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发表时间：
2010-12-01
影响因子：
3.7
通讯作者：
Hoffmann, A.
中科院分区：
文献类型：
--
作者：
Mosendz, O.;Vlaminck, V.;Hoffmann, A.
自旋泵浦是一种通过宏观界面区域上的铁磁共振产生自旋电流的机制，从而能够灵敏地检测逆自旋霍尔效应，该效应将自旋转化为非磁性导体中的充电电流。在这里，我们研究了由于集成到不同普通金属的共面波导中的坡莫合金/普通金属双层中的逆自旋霍尔效应而产生的自旋泵浦感应电压，以及作为施加磁场方向角度以及微波频率和功率的函数。我们发现实验数据和理论模型之间有很好的一致性，其中包括各向异性磁阻和逆自旋霍尔效应的贡献。只要考虑到精确的磁化轨迹，该分析就可以在各种实验条件下提供一致的结果。 Pt、Pd、Au 和 Mo 的自旋霍尔角经高精度测定，分别为 0.013 +/- 0.002、0.0064 +/- 0.001、0.0035 +/- 0.0003 和 -0.0005 +/- 0.0001。
Spin pumping is a mechanism that generates spin currents from ferromagnetic resonance over macroscopic interfacial areas, thereby enabling sensitive detection of the inverse spin Hall effect that transforms spin into charge currents in nonmagnetic conductors. Here we study the spin-pumping-induced voltages due to the inverse spin Hall effect in permalloy/normal metal bilayers integrated into coplanar waveguides for different normal metals and as a function of angle of the applied magnetic field direction, as well as microwave frequency and power. We find good agreement between experimental data and a theoretical model that includes contributions from anisotropic magnetoresistance and inverse spin Hall effect. The analysis provides consistent results over a wide range of experimental conditions as long as the precise magnetization trajectory is taken into account. The spin Hall angles for Pt, Pd, Au, and Mo were determined with high precision to be 0.013 +/- 0.002, 0.0064 +/- 0.001, 0.0035 +/- 0.0003, and -0.0005 +/- 0.0001, respectively.