大自旋轨道相互作用极限下AuW合金自旋扩散长度的自旋吸收测量
Evaluation of the spin diffusion length of AuW alloy by spin absorption experiments in the limit of large spin-orbit interactions
摘要：
自旋扩散长度$λ_{A}$的知识是估计自旋霍尔角的先决条件。我们研究了自旋电流吸收的材料与小$λ_{A}$使用AuW条纹插入横向自旋阀。AuW条纹的宽度变化导致自旋吸收的剧烈变化，这不能用常规分析来解释。我们表明，自旋电流极化和自旋吸收体附近的自旋累积衰减必须精确地考虑到准确的估计$λ_{A}$。我们提出了一个分析模型支持的数值计算，允许提取适当的$λ_{A}$值的自旋霍尔效应材料。
英文摘要：
The knowledge of the spin diffusion length $λ_{A}$ is a prerequisite for the estimation of the spin Hall angle. We investigate spin current absorption of materials with small $λ_{A}$ using AuW stripes inserted in lateral spin-valves. Width variations of the AuW stripe lead to drastic changes of the spin absorption, which cannot be explained by conventional analysis. We show that the spin-current polarization and the spin accumulation attenuation in the vicinity of the spin absorber must to be precisely taken into account for accurate estimation of $λ_{A}$. We propose an analytical model supported by numerical calculations that allows to extract proper $λ_{A}$ values of spin Hall effect materials.
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