Thermally activated phase slips in superfluid spin transport in magnetic wires
Thermally activated phase slips in superfluid spin transport in magnetic wires
复制标题
磁线中超流体自旋输运中的热激活相滑移
DOI：
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发表时间：
2015
影响因子：
3.7
通讯作者：
Y. Tserkovnyak
中科院分区：
文献类型：
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作者：
Se Kwon Kim;S. Takei;Y. Tserkovnyak
我们在随机Landau-Lifshitz-Gilbert唯象的框架下，从理论上研究了超流体自旋输运中的热激活相滑移，该唯象与超导线热电阻的Langer-Ambeaokar-McCumber-Halperin理论平行。为此，我们首先得到自由能极小值和鞍点的精确解。我们给出了零自旋电流极限下的相滑移率的解析表达式，其中包括对自由能极值处的自旋涨落的详细分析。提出了一种磁电测量电路的实验装置，该装置可以通过测量非局部磁阻来推断热相移。
We theoretically study thermally-activated phase slips in superfluid spin transport in easy-plane magnetic wires within the stochastic Landau-Lifshitz-Gilbert phenomenology, which runs parallel to the Langer-Ambegaokar-McCumber-Halperin theory for thermal resistances in superconducting wires. To that end, we start by obtaining the exact solutions for free-energy minima and saddle points. We provide an analytical expression for the phase-slip rate in the zero spin-current limit, which involves detailed analysis of spin fluctuations at extrema of the free energy. An experimental setup of a magnetoeletric circuit is proposed, in which thermal phase slips can be inferred by measuring nonlocal magnetoresistance.