Measuring anisotropic spin relaxation in graphene
Measuring anisotropic spin relaxation in graphene
复制标题
测量石墨烯中的各向异性自旋弛豫
DOI:
10.1103/physrevb.97.205439
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发表时间:
2018
影响因子:
3.7
通讯作者:
Hopperdietzel
中科院分区:
文献类型:
--
作者:
Ringer;Rosenauer;Völkl;Hopperdietzel
We compare different methods to measure the anisotropy of the spin lifetime in graphene. In addition to out-of-plane rotation of the ferromagnetic electrodes and oblique spin precession, we present a Hanle experiment where the electron spins precess around either a magnetic field perpendicular to the graphene plane or around an in-plane field. In the latter case, electrons are subject to both in-plane and out-of-plane spin relaxation. To fit the data, we use a numerical simulation that can calculate precession with anisotropies in the spin lifetimes under magnetic fields in any direction. Our data show a small, but distinct anisotropy that can be explained by the combined action of isotropic mechanisms, such as relaxation by the contacts and resonant scattering by magnetic impurities, and an anisotropic Rashba spin-orbit based mechanism. We also assess potential sources of error in all three types of experiment and conclude that the in-plane/out-of-plane Hanle method is most reliable.
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