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Topological spin transport by Brownian diffusion of domain walls

机译：通过畴壁的布朗扩散进行拓扑自旋输运

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摘要

We propose thermally populated domain walls (DWs) in an easy-plane ferromagnetic insulator as robust spin carriers between two metals. The chirality of a DW, which serves as a topological charge, couples to the metal spin accumulation via spin-transfer torque and results in the chirality-dependent thermal nucleation rates of DWs at the interface. After overpopulated DWs of a particular (net) chirality diffuse and leave the ferromagnet at the other interface, they reemit the spin current by spin pumping. The conservation of the topological charge supports an algebraic decay of spin transport as the length of the ferromagnet increases; this is analogous to the decaying behavior of superfluid spin transport but contrasts with the exponential decay of magnon spin transport. We envision that similar spin transport with algebraic decay may be implemented in materials with exotic spin phases by exploiting topological characteristics and the associated conserved quantities of their excitations.
机译：我们提出在易平面铁磁绝缘体中的热填充畴壁（DW）作为两种金属之间的稳健自旋载流子。用作拓扑电荷的DW的手性通过自旋传递扭矩耦合到金属自旋积累，并导致界面处DW的手性依赖的热成核速率。特定（净）手征性的过饱和DW扩散并在另一界面处留下铁磁体后，它们通过自旋泵重新释放自旋电流。随着铁磁体长度的增加，拓扑电荷的守恒支持自旋输运的代数衰减。这类似于超流体自旋输运的衰减行为，但与磁振子自旋输运的指数衰减相反。我们设想，通过利用拓扑特性及其激发的相关守恒量，可以在具有奇异自旋相的材料中实现具有代数衰减的相似自旋输运。

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  • 来源
    《Physical review》 |2015年第22期|220409.1-220409.5|共5页
  • 作者

    Se Kwon Kim; So Takei; Yaroslav Tserkovnyak;

  • 作者单位

    Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA;

    Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA;

    Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    diffusion of other defects; classical spin models;

    机译：其他缺陷的扩散;经典自旋模型;

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