Search for the mechanism of the spin Hall effect

寻找自旋霍尔效应的机理

• 批准号: 22840012
• 负责人: NIIMI Yasuhiro
• 金额: $ 2万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Research Activity Start-up
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22840012/
• 关键词: スピントロニクス; スピン流; スピンホール効果; 強磁性体; メソスコピック系

We have studied extrinsic spin Hall effect(SHE) in Cu-based alloys. Copper has a very weak spin-orbit(SO) interaction and the SHE of Cu itself is negligibly small. However, by adding impurities with strong SO interactions such as Ir and Bi, the extrinsic SHEs can be generated. Unlike pure SHE materials such as Pt and Pd, one of the big advantages for the extrinsic SHE is that it allows controlling the SH angle, characteristic of the conversion yield between charge and spin, by changing the combination of host and impurity metals as well as by tuning the impurity concentration. By doping with Ir impurities, we observe a clear SHE signal. From the slope of the SH resistivity as a function of doping concentration, we estimate the SH angle to be 2%. When Ir impurities are replaced by Bi ones, the obtained SH angle is more than one order larger than that of CuIr alloys.

研究了铜基合金中的自旋霍尔效应（SHE）。铜具有非常弱的自旋轨道相互作用，铜本身的SHE小得可以忽略不计。然而，通过添加具有强SO相互作用的杂质，如Ir和Bi，可以产生外源性she。与纯SHE材料（如Pt和Pd）不同，外源SHE的一大优点是，它可以通过改变宿主金属和杂质金属的组合以及调整杂质浓度来控制SH角，这是电荷和自旋之间转换产率的特征。通过掺杂Ir杂质，我们观察到一个清晰的SHE信号。根据SH电阻率随掺杂浓度的斜率，我们估计SH角为2%。当用Bi杂质代替Ir杂质时，得到的SH角比CuIr合金大一个数量级以上。

项目成果

Extrinsic spin Hall effects in Cu-based alloys

铜基合金中的外在自旋霍尔效应

• 发表时间: 2011
• 作者: T. Kobayashi;M. Yamaguchi and J. Yokoyama;Y. Niimi
• 通讯作者: Y. Niimi

Extrinsic spin Hall effccts in Cu induced by Ir impurity

Ir 杂质引起的 Cu 外在自旋霍尔效应

• 发表时间: 2010
• 作者: T.Hama;N.Watanabe;A.Kouchi;M.Yokoyama;北川健太郎;Y.Niimi
• 通讯作者: Y.Niimi

巨大スピン蓄積の生成と検出

巨自旋积累的产生和检测

• 发表时间: 2011
• 作者: Tsutomu Kobayashi;Masahide Yamaguchi;Jun'ichi Yokoyama;Y.Oba;新見康洋
• 通讯作者: 新見康洋

Cu合金における外因性スピンホール効果

铜合金中的外在自旋霍尔效应

• 发表时间: 2011
• 作者: Kei-ichi Maeda;他;新見康洋
• 通讯作者: 新見康洋

Extrinsic Spin Hall Effect Induced by Iridium Impurities in Copper

• DOI: 10.1103/physrevlett.106.126601
• 发表时间: 2011-03-22
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Niimi, Y.;Morota, M.;Otani, Y.
• 通讯作者: Otani, Y.