用非局域自旋阀测量估算Heusler化合物薄膜的自旋极化：Co $_{2}$ FeSi和Fe $_{3}$ Si的比较
Estimation of the spin polarization for Heusler-compound thin films by means of nonlocal spin-valve measurements: Comparison of Co$_{2}$FeSi and Fe$_{3}$Si
摘要：
我们研究了室温下纯自旋电流的产生和检测使用横向自旋阀器件与Heusler复合电极，Co $_{2}$ FeSi（CFS）或Fe $_{3}$ Si（FS）。非局域自旋阀（NLSV）信号的大小受到电阻率色散的严重影响，这在低温生长的具有有序结构的Heusler化合物中是特别常见的。从一维自旋扩散模型的基础上的分析，我们发现，自旋极化随电阻率的降低，这取决于结构的有序性，CFS和FS电极单调增加，并验证CFS具有相对较大的自旋极化相比，FS。
英文摘要：
We study room-temperature generation and detection of pure spin currents using lateral spin-valve devices with Heusler-compound electrodes, Co$_{2}$FeSi (CFS) or Fe$_{3}$Si (FS). The magnitude of the nonlocal spin-valve (NLSV) signals is seriously affected by the dispersion of the resistivity peculiarly observed in the low-temperature grown Heusler compounds with ordered structures. From the analysis based on the one-dimensional spin diffusion model, we find that the spin polarization monotonically increases with decreasing the resistivity, which depends on the structural ordering, for both CFS and FS electrodes, and verify that CFS has relatively large spin polarization compared with FS.
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