半经典区域中磁振子介导的热自旋泵浦
摘要
我们在半经典区域微观分析了铁磁绝缘体与非磁性金属界面处磁振子介导的热自旋泵浦。通过计算热自旋转移力矩来讨论自旋流的产生，该力矩破坏了传导电子的自旋守恒定律并驱动相干磁振子态。传导电子与磁振子之间的非均匀热涨落诱导出净自旋流，该自旋流被泵入相邻的非磁性金属。泵浦的自旋流与温差成正比。当磁振子的有效温度低于传导电子的有效温度时，局域自旋通过发射磁振子失去自旋角动量，而传导电子通过吸收所有发射的动量从自旋向下翻转为自旋向上，反之亦然。零模磁振子不能贡献热自旋泵浦，因为它们被自旋翻转条件消除。因此，热自旋泵浦不需要任何形式的外加磁场。我们讨论了与Xiao等人[Phys. Rev. B, 81 (2010) 214418]、Adachi等人[Phys. Rev. B, 83 (2011) 094410]和Bender等人[arXiv:1111.2382]提出的理论的区别。
引用
@article{arxiv.1204.5811,
title = {Thermal spin pumping mediated by magnon in the semiclassical regime},
author = {Kouki Nakata},
journal= {arXiv preprint arXiv:1204.5811},
year = {2012}
}
备注
14 pages, 3 figures. We would like to thank the referee for suggesting to emphasize (clarify) the distinction from the recent preprint by Bender et al. [arXiv:1111.2382]. v2; Fig. 3 is available at the URL specified in this document. We would like to thank S. A. Bender for giving the detailed explanation for their work. arXiv admin note: substantial text overlap with arXiv:1201.1947