Sign determination of spin polarization in L2_1-ordered Co_2FeSi using a Pt-based spin Hall device
Sign determination of spin polarization in L2_1-ordered Co_2FeSi using a Pt-based spin Hall device
复制标题
使用 Pt 基自旋霍尔器件测定 L2_1 有序 Co_2FeSi 中自旋极化的符号
DOI：
10.1103/physrevb.86.174412
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发表时间：
2012
影响因子：
3.7
通讯作者：
and K. Hamaya
中科院分区：
文献类型：
--
作者：
S. Oki;K. Masaki;N. Hashimoto;S Yamada. M. Miyata;M. Miyao;T. Kimura;and K. Hamaya
到目前为止，我们已经通过使用非局部自旋阀测量检测纯自旋电流，在有序的Heusler化合物（CFS）中证明了明显的高自旋极化（）。在这里，我们通过实验确定了有序CFS中自旋霍尔效应（SHE）的偏振符号。在20 K时，我们可以清楚地检测到具有正符号迟滞回路的逆SHE信号。由于Pt的自旋霍尔电导率为正号，所以有序结构的CFS电极产生的纯自旋电流具有正的自旋极化。SHE测量是确定未知自旋注入器中自旋极化标志的有力工具。
So far, we have demonstrated markedly high spin polarizations () in one of the-ordered Heusler compounds,(CFS), by detecting pure spin currents using nonlocal spin-valve measurements. Here, we experimentally determine the sign of the spin polarization in the-ordered CFS using the electrical spin Hall effect (SHE) measurements in a lateral device with Pt. Inverse SHE signals with a positive-sign hysteresis loop are clearly detected at 20 K. Since the spin Hall conductivity of Pt is the positive sign, the pure spin current generated by the CFS electrode with-ordered structures has positive spin polarization. The SHE measurement is a powerful tool to determine the sign of the spin polarization in unknown spin injectors.