Inverse spin Hall effect in Ni81Fe19/normal-metal bilayers
Inverse spin Hall effect in Ni81Fe19/normal-metal bilayers
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DOI：
10.1103/physrevb.89.060407
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发表时间：
2014-02-28
影响因子：
3.7
通讯作者：
Woltersdorf, G.
中科院分区：
文献类型：
--
作者：
Obstbaum, M.;Haertinger, M.;Woltersdorf, G.
自旋霍尔角的已发表值分布广泛，即使对于研究最多的普通金属铂来说，也反映了研究逆自旋霍尔效应的难度。在这篇《快速通讯》中，我们研究了使用共面波导自旋泵浦操作的不同 Ni81Fe19(Py)/普通金属双层的逆自旋霍尔效应和各向异性磁阻。角度、频率和温度相关测量表明，只有当避免各向异性磁阻作为寄生电压产生效应时，自旋泵浦和逆自旋霍尔效应才能用于量化自旋霍尔角。在这种情况下，我们获得 Pt 和 Au 的自旋霍尔角分别为 0.12 和 0.011。此外，这些测量可用于确定 Pt 的自旋扩散长度随温度的变化。
The large spread of published values for spin Hall angles, even for the most studied normal-metal platinum, reflects the difficulty of investigating the inverse spin Hall effect. In this Rapid Communication we examine the inverse spin Hall effect and anisotropic magnetoresistance for different Ni81Fe19(Py)/normal-metal bilayers operated by spin pumping using a coplanar waveguide. Angle, frequency, and temperature dependent measurements show that spin pumping and the inverse spin Hall effect can be used to quantify spin Hall angles only when the anisotropic magnetoresistance as a parasitic voltage generating effect is avoided. In this case we obtain spin Hall angles of 0.12 and 0.011 for Pt and Au, respectively. Furthermore, these measurements can be used to determine the spin diffusion length of Pt as a function of temperature.