Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
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DOI：
10.1103/physrevlett.110.016805
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发表时间：
2013-01-03
影响因子：
8.6
通讯作者：
Otani, YoshiChika
中科院分区：
文献类型：
--
作者：
Niimi, Yasuhiro;Wei, Dahai;Otani, YoshiChika
我们从实验上证实，由弱反局域化测量得到的贵金属的自旋轨道长度与由横向自旋阀测量得到的自旋扩散长度相当。即使对于具有强自旋-轨道相互作用的金属，如铂，我们也验证了这两种方法给出的可比值比最近的自旋扭矩铁磁共振测量得到的值要大得多。为了进一步证明这两种长度尺度之间的可比性，我们通过改变导线的厚度测量了铜的自旋轨道长度的无序依赖关系。得到的自旋轨道长度与扩散系数的函数符合线性规律，这清楚地表明在自旋扩散长度的情况下，Elliott-Yafet机制占主导地位。DOI：10.1103/PhysRevLett.110.016805
We experimentally confirmed that the spin-orbit lengths of noble metals obtained from weak antilocalization measurements are comparable to the spin diffusion lengths determined from lateral spin valve ones. Even for metals with strong spin-orbit interactions such as Pt, we verified that the two methods gave comparable values which were much larger than those obtained from recent spin torque ferromagnetic resonance measurements. To give a further evidence for the comparability between the two length scales, we measured the disorder dependence of the spin-orbit length of copper by changing the thickness of the wire. The obtained spin-orbit length nicely follows a linear law as a function of the diffusion coefficient, clearly indicating that the Elliott-Yafet mechanism is dominant as in the case of the spin diffusion length. DOI: 10.1103/PhysRevLett.110.016805