Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime
Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime
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DOI：
10.1103/physrevb.94.060412
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发表时间：
2016-08-30
影响因子：
3.7
通讯作者：
Casanova, Felix
中科院分区：
文献类型：
--
作者：
Sagasta, Edurne;Omori, Yasutomo;Casanova, Felix
利用横向自旋阀器件中的自旋吸收方法，系统地测量和分析了具有较宽电导率范围的Pt中的自旋扩散长度和自旋霍尔效应。我们观察到的自旋扩散长度和电导率之间的线性关系，证明自旋弛豫在Pt是由Elliott-Yafet机制。我们发现一个单一的内在自旋霍尔电导率（sigma（int）（SH/）= 1600 +/- 150 Ω（-1）cm（-1））的Pt在整个范围内研究，这是在良好的协议与理论。通过调节电导率，我们得到了自旋霍尔效应的适度脏和超净标度区域之间的交叉。这与反常霍尔效应的结果是等价的。我们的结果解释了文献中自旋霍尔角值的分布，并找到了最大化这个重要参数的路线。
We systematically measure and analyze the spin diffusion length and the spin Hall effect in Pt with a wide range of conductivities using the spin absorption method in lateral spin valve devices. We observe a linear relation between the spin diffusion length and the conductivity, evidencing that the spin relaxation in Pt is governed by the Elliott-Yafet mechanism. We find a single intrinsic spin Hall conductivity (sigma(int)(SH/) = 1600 +/- 150 Omega(-1) cm(-1)) for Pt in the full range studied which is in good agreement with theory. We have obtained the crossover between the moderately dirty and the superclean scaling regimes of the spin Hall effect by tuning the conductivity. This is equivalent to that obtained for the anomalous Hall effect. Our results explain the spread of the spin Hall angle values in the literature and find a route to maximize this important parameter.