Measuring anisotropic spin relaxation in graphene

Measuring anisotropic spin relaxation in graphene
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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
期刊:
影响因子:
3.7
通讯作者:
Hopperdietzel
Hopperdietzel
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ringer;Rosenauer;Völkl;Hopperdietzel

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我们比较了测量石墨烯自旋寿命各向异性的不同方法。除了铁磁电极的面外旋转和倾斜自旋进动之外,我们还提出了一个Hanle实验,其中电子自旋围绕垂直于石墨烯平面的磁场或围绕面内场进动。在后一种情况下,电子受到面内和面外自旋弛豫的影响。为了拟合这些数据,我们使用了一个数值模拟,可以计算在任何方向的磁场下自旋寿命中各向异性的进动。我们的数据显示了一个小的,但明显的各向异性,可以解释的各向同性机制的联合行动,如松弛的接触和共振散射的磁性杂质,和各向异性Rashba自旋轨道为基础的机制。我们还评估了所有三种类型的实验中的潜在误差来源,并得出结论,平面内/平面外汉勒方法是最可靠的。
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.
DOI: 10.1038/srep21046
发表时间: 2016-02-15
期刊: Scientific reports
影响因子: 4.6
作者:
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通讯作者: Roche S
磁性杂质的共振散射作为双层石墨烯自旋弛豫的模型。
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