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arXiv 0906.1002cond-mat.mes-hall
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织构磁体中的热电自旋转移

Thermoelectric spin transfer in textured magnets

Alexey A. Kovalev, Yaroslav Tserkovnyak

摘要:

本文研究了磁织构存在下准一维磁线中的电荷和能量输运。能量流可以用类似于电荷电流的方式表示,从而产生新的能量电流感应自旋力矩。类似于电荷流,我们可以识别两种相互作用:由能流引起的磁序参量上的自旋转移矩和由Berry相规范场引起的能流。此外,我们唯象地引入了新的$β-$,如磁动力学和能量流之间的粘性耦合到LLG方程,它起源于磁序的自旋错误跟踪。我们的结论是,新的粘性项应该是重要的热诱导畴壁运动。我们研究了电荷和能量电流之间的相互作用,发现许多纹理运动对电荷电流的影响可以复制相对于能量电流。例如,移动纹理可以导致能量流,其是在充电电流的情况下的电动势的模拟。我们建议通过磁织构动力学实现冷却效应。

英文摘要:

We study charge and energy transport in a quasi-1D magnetic wire in the presence of magnetic textures. The energy flows can be expressed in a fashion similar to charge currents, leading to new energy-current induced spin torques. In analogy to charge currents, we can identify two reciprocal effects: spin-transfer torque on the magnetic order parameter induced by energy current and the Berry-phase gauge field induced energy flow. In addition, we phenomenologically introduce new $β-$like viscous coupling between magnetic dynamics and energy current into the LLG equation, which originates from spin mistracking of the magnetic order. We conclude that the new viscous term should be important for the thermally induced domain wall motion. We study the interplay between charge and energy currents and find that many of the effects of texture motion on the charge currents can be replicated with respect to energy currents. For example, the moving texture can lead to energy flows which is an analogue of the electromotive force in case of charge currents. We suggest a realization of cooling effect by magnetic texture dynamics.

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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