Spin Hall angle versus spin diffusion length: Tailored by impurities
Spin Hall angle versus spin diffusion length: Tailored by impurities
复制标题
DOI：
10.1103/physrevb.81.245109
复制
发表时间：
2010-06-08
影响因子：
3.7
通讯作者：
Mertig, Ingrid
中科院分区：
文献类型：
--
作者：
Gradhand, Martin;Fedorov, Dmitry V.;Mertig, Ingrid
我们进行了从头算研究，以寻找材料，其中一个大的自旋霍尔效应所造成的斜散射是伴随着一个长的自旋扩散长度。具有这种性质的样品是全金属自旋电子学器件的有希望的候选者。在这里，我们考虑Cu，Au和Pt的主机，这是在实验中使用的典型材料。特别是，我们确定了轻杂质如Au中的C和N和重杂质如Cu中的Bi以满足该标准。它们表现出大的自旋霍尔角（α> 0.06）和约100 nm的适当自旋扩散长度。此外，一个显着的依赖性的自旋扩散长度上的散射性质的杂质被发现为Cu和Au主机，在Pt的变化小得多的地方得到相反。
We performed ab initio studies to search for materials where a large spin Hall effect caused by skew scattering is accompanied by a long spin diffusion length. Samples with such properties are promising candidates for all-metallic spintronics devices. Here we consider Cu, Au, and Pt hosts which are typical materials used in experiments. In particular, we identified light impurities such as C and N in Au and heavy impurities such as Bi in Cu to meet this criterion. They exhibit a large spin Hall angle (alpha > 0.06) and an appropriate spin diffusion length of about 100 nm. In addition, a pronounced dependence of the spin diffusion length on the scattering properties of the impurity is found for Cu and Au hosts, in contrast to Pt where much smaller variations are obtained.