Spin Hall angle quantification from spin pumping and microwave photoresistance
Spin Hall angle quantification from spin pumping and microwave photoresistance
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来自自旋泵浦和微波光阻的自旋霍尔角量化
DOI：
10.1103/physrevb.85.214423
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发表时间：
2012-06-20
影响因子：
3.7
通讯作者：
Ding, H. F.
中科院分区：
文献类型：
--
作者：
Feng, Z.;Hu, J.;Ding, H. F.
我们提出了一种方法来量化自旋霍尔角（SHA）与自旋泵和微波光电阻测量。用这种方法，我们分离的逆自旋霍尔效应（ISHE）从其他不必要的影响坡莫合金/铂双层膜使用面外微波激发。通过微波光阻测量，在和出平面进动角的磁化被确定，并使注入的纯自旋电流的准确测定。该方法被证明与一个几乎完美的洛伦兹线形状为所获得的ISHE信号和频率无关SHA值的理论预测。通过改变Pt厚度，Pt的SHA和自旋扩散长度分别被量化为0.012（0.001）和8.3（0.9）nm。
We present a method to quantify the spin Hall angle (SHA) with spin pumping and microwave photoresistance measurements. With this method, we separate the inverse spin Hall effect (ISHE) from other unwanted effects for permalloy/Pt bilayers using out-of-plane microwave excitation. Through microwave photoresistance measurements, the in- and out-of-plane precessing angles of the magnetization are determined and enabled for the exact determination of the injected pure spin current. This method is demonstrated with an almost perfect Lorentz line-shape for the obtained ISHE signal and the frequency independent SHA value as predicted by theory. By varying the Pt thickness, the SHA and spin-diffusion length of Pt is quantified as 0.012 (0.001) and 8.3 (0.9) nm, respectively.