Quantum-kinetic theory of spin-transfer torque and magnon-assisted transport in nanoscale magnetic junctions
Quantum-kinetic theory of spin-transfer torque and magnon-assisted transport in nanoscale magnetic junctions
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DOI：
10.1103/physrevb.99.024434
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发表时间：
2018-08
影响因子：
3.7
通讯作者：
S. Bender;R. Duine;Y. Tserkovnyak
中科院分区：
文献类型：
--
作者：
S. Bender;R. Duine;Y. Tserkovnyak
从理论上研究了自旋涨落在磁结电荷输运中的作用。最近的实验，测量的电流对电偏压的非线性依赖性的动机，我们开发了一个系统的理解纳米磁性结中的电荷和自旋动力学的相互作用。我们的模型捕捉到了两个不同的功能所产生的这些波动：磁振子辅助运输和自旋转移力矩的磁导的影响。后者源于自旋电流波动引起的结中的磁失准。随着温度的降低，非弹性量子散射取代了热波动，表现出的特征使其很容易与磁振子辅助传输区分开来。
We theoretically investigate the role of spin fluctuations in charge transport through a magnetic junction. Motivated by recent experiments that measure a nonlinear dependence of the current on electrical bias, we develop a systematic understanding of the interplay of charge and spin dynamics in nanoscale magnetic junctions. Our model captures two distinct features arising from these fluctuations: magnon-assisted transport and the effect of spin-transfer torque on the magnetoconductance. The latter stems from magnetic misalignment in the junction induced by spin-current fluctuations. As the temperature is lowered, inelastic quantum scattering takes over thermal fluctuations, exhibiting signatures that make it readily distinguishable from magnon-assisted transport.