Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Phys Rev Lett. 2010 Jun 11;104(23):237202. doi: 10.1103/PhysRevLett.104.237202. Epub 2010 Jun 8.
Spin relaxation in mesoscopic Ag wires in the diffusive transport regime is studied via nonlocal spin valve and Hanle effect measurements performed on Permalloy/Ag lateral spin valves. The ratio between momentum and spin relaxation times is not constant at low temperatures. This can be explained with the Elliott-Yafet spin relaxation mechanism by considering the momentum surface relaxation time as being temperature dependent. We present a model to separately determine spin flip probabilities for phonon, impurity and surface scattering and find that the spin flip probability is highest for surface scattering.
通过在横向坡莫合金/银自旋阀上进行非局域自旋阀和 Hanle 效应测量，研究了扩散输运 regime 中介观 Ag 线中的自旋弛豫。在低温下，动量和自旋弛豫时间的比值不是常数。通过考虑动量表面弛豫时间随温度变化，可以用 Elliott-Yafet 自旋弛豫机制来解释这一点。我们提出了一个模型来分别确定声子、杂质和表面散射的自旋翻转概率，并发现表面散射的自旋翻转概率最高。
