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arXiv 1104.0552cond-mat.mes-hallcond-mat.supr-con
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FMR和正常金属-铁磁体-超导体三层中的电压诱导输运

FMR and voltage induced transport in normal metal-ferromagnet-superconductor trilayers

Hans Joakim Skadsem, Arne Brataas, Jan Martinek, Yaroslav Tserkovnyak

摘要:

本文研究了正常金属-铁磁体-超导体三层膜中由偏压和/或磁化旋进引起的亚带自旋和电荷输运。输运性质的时间相关的散射理论进行了讨论。我们假设超导能隙在费米能和铁磁交换分裂所设定的能量尺度上是小的,计算了在有限外加电压下,非平衡电荷和自旋电流对旋进频率的一阶响应.我们发现,电压感应的瞬时电荷电流和纵向自旋电流不受旋进磁化的影响,而泵浦的横向自旋电流由自旋相关的电导和电子-空穴散射矩阵的细节决定。对于铁磁体长度大于横向自旋相干长度的结构,导出了横向自旋电流的简化表达式。

英文摘要:

We study the subgap spin and charge transport in normal metal-ferromagnet-superconductor trilayers induced by bias voltage and/or magnetization precession. Transport properties are discussed in terms of time-dependent scattering theory. We assume the superconducting gap is small on the energy scales set by the Fermi energy and the ferromagnetic exchange splitting, and compute the non-equilibrium charge and spin current response to first order in precession frequency, in the presence of a finite applied voltage. We find that the voltage-induced instantaneous charge current and longitudinal spin current are unaffected by the precessing magnetization, while the pumped transverse spin current is determined by spin-dependent conductances and details of the electron-hole scattering matrix. A simplified expression for the transverse spin current is derived for structures where the ferromagnet is longer than the transverse spin coherence length.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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