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arXiv 1702.05286cond-mat.mtrl-sci
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自旋阀中自旋相关的生热机制

Mechanisms of spin-dependent heat generation in spin valves

Xiao-Xue Zhang, Yao-Hui Zhu, Pei-Song He, Bao-He Li

摘要:

自旋输运过程中产生的额外热量通常用自旋弛豫来解释。通过重新表述产热率,我们发现了没有交叉效应的交替电流-力对,这使我们能够将每对的产物解释为不同的产热机制。结果表明,与自旋相关的生热部分包括两项。其中之一是正比于自旋积累的平方,并产生于自旋弛豫。然而,另一个与自旋累积梯度的平方成比例,并且应该归因于另一种机制,即自旋扩散。我们在一个典型的自旋阀中说明了这两种机制的特性。

英文摘要:

The extra heat generation in spin transport is usually interpreted in terms of the spin relaxation. By reformulating the heat generation rate, we found alternative current-force pairs without cross effects, which enable us to interpret the product of each pair as a distinct mechanism of heat generation. The results show that the spin-dependent part of the heat generation includes two terms. One of them is proportional to the square of the spin accumulation and arises from the spin relaxation. However, the other is proportional to the square of the spin-accumulation gradient and should be attributed to another mechanism, the spin diffusion. We illustrated the characteristics of the two mechanisms in a typical spin valve with a finite nonmagnetic spacer layer.

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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