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arXiv 1302.0499cond-mat.mes-hallcond-mat.mtrl-sci
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光谱非均匀温度、非局部热传递和自旋塞贝克效应

Spectral non-uniform temperature, non-local heat transfer, and the spin Seebeck effect

K. S. Tikhonov, J. Sinova, A. M. Finkel'stein

摘要:

本文提出了一个由亚热非局域声子热传递和光谱非均匀温度分布驱动的自旋Seebeck效应的理论。该理论解释了这种效应的非局部行为,其原因是存储能量(热)的声子和传递能量(亚热)的声子位于光谱的不同部分,并且具有非常不同的动力学。这引起了光谱声子分布函数,偏离局部平衡沿基板和边界条件是敏感的。该理论还预测了铁磁金属中的效应的非磁振子起源,与最近的实验观察一致。从衬底到Pt探针和向后的热流的平衡导致由本地热声子拖曳的自旋极化电子产生的可测量的垂直自旋电流。我们预测特定的样本长度限制和其他依赖性,可以通过实验探测,并获得正确的影响幅度。

英文摘要:

We present a theory of the spin Seebeck effect driven by subthermal non-local phonon heat transfer and spectral non-uniform temperature distribution. The theory explains the non-local behavior of the effect arising from the fact that phonons that store the energy (thermal) and the phonons that transfer it (subthermal) are located in different parts of the spectrum and have very different kinetics. This gives rise to a spectral phonon distribution function that deviates from local equilibrium along the substrate and is sensitive to boundary conditions. The theory also predicts a non-magnon origin of the effect in ferromagnetic metals in agreement with observations in recent experiments. Equilibration of the heat flow out of the substrate to the Pt probe and backwards leads to a measurable vertical spin-current produced by the spin polarized electrons dragged by the local thermal phonons. We predict specific sample length limits and other dependencies that can be probed experimentally, and obtain the correct magnitude of the effect.

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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