The spin Hall angle and spin diffusion length of Pd measured by spin pumping and microwave photoresistance
The spin Hall angle and spin diffusion length of Pd measured by spin pumping and microwave photoresistance
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DOI：
10.1063/1.4862215
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发表时间：
2014-01
影响因子：
3.2
通讯作者：
X. Tao;Zheng Feng;B. Miao;L. Sun;B. You;Di Wu;J. Du;W. Zhang;H. Ding
中科院分区：
文献类型：
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作者：
X. Tao;Zheng Feng;B. Miao;L. Sun;B. You;Di Wu;J. Du;W. Zhang;H. Ding
利用自旋泵效应和微波光阻效应对Pd的自旋霍尔角和自旋扩散长度进行了实验研究。Py/Pd双层膜带是用面外微波磁场激发的。因此，纯自旋电流被泵浦，并通过Pd层中的逆自旋霍尔效应（ISHE）转变为电荷电流，产生ISHE电压。根据ISHE电压和各向异性磁电阻引起的无用信号的不同对称性，可以区分ISHE电压和无用信号。连同Pd厚度相关的面内和面外旋进角和有效自旋混合电导的测量，Pd的SHA和自旋扩散长度分别被量化为0.0056 ± 0.0007和7.3 ± 0.7 nm。
We present the experimental study of the spin Hall angle (SHA) and spin diffusion length of Pd with the spin pumping and microwave photoresistance effects. The Py/Pd bilayer stripes are excited with an out-of-plane microwave magnetic field. The pure spin current is thus pumped and transforms into charge current via the inverse spin Hall effect (ISHE) in Pd layer, yielding an ISHE voltage. The ISHE voltage can be distinguished from the unwanted signal caused by the anisotropic magnetoresistance according to their different symmetries. Together with Pd thickness dependent measurements of in and out-of-plane precessing angles and effective spin mixing conductance, the SHA and spin-diffusion length of Pd are quantified as 0.0056 ± 0.0007 and 7.3 ± 0.7 nm, respectively.