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arXiv 2302.04551cond-mat.mes-hallcond-mat.mtrl-sci
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拓扑铁磁体快速电子注入诱导的自旋纹理中的自旋转矩与反常速度:规范场的作用

Spin torques and anomalous velocity in spin textures induced by fast electron injection from topological ferromagnets: The role of gauge fields

Satadeep Bhattacharjee, Seung-Cheol Lee

AI总结:

提出分析拓扑铁磁源快速电子注入下自旋纹理磁化动力学的新方法,揭示规范场与相对论偶极矩产生的类阻尼/反类阻尼转矩及类似拓扑霍尔效应的反常速度。

摘要:

本文提出了一种新方法,用于分析在来自 Dirac half metal(狄拉克半金属)等拓扑铁磁源的快速电子注入影响下,自旋纹理中的磁化动力学。这些电子以速度 v 运动,且 v/c(其中 c 为光速)的值不可忽略;它们会在自旋纹理区域产生非平衡磁化密度,该密度通过相对论相互作用与电偶极矩相关联。当由此产生的偶极矩与自旋纹理区域中的规范场相互作用时,会形成一个有效场,进而产生自旋转矩。这些转矩类似于电子从重金属注入铁磁体时出现的自旋轨道转矩,可同时表现出类阻尼和反类阻尼特性。最后,我们证明偶极矩与规范场之间的这种相互作用会引入反常速度,该反常速度能够以可与拓扑霍尔效应相比拟的方式促进自旋纹理中的横向电导。

英文摘要:

A new method for analysing magnetization dynamics in spin textures under the influence of fast electron injection from topological ferromagnetic sources such as Dirac half metals has been proposed. These electrons, traveling at a velocity $v$ with a non-negligible value of $v/c$ (where c is the speed of light), generate a non-equilibrium magnetization density in the spin-texture region, which is related to an electric dipole moment via relativistic interactions. When this resulting dipole moment interacts with gauge fields in the spin-texture region, an effective field is created that produces spin torques. These torques, like spin-orbit torques that occur when electrons are injected from a heavy metal into a ferromagnet, can display both damping-like and anti-damping-like properties. Finally, we demonstrate that such an interaction between the dipole moment and the gauge field introduces an anomalous velocity that can contribute to transverse electrical conductivity in the spin texture in a way comparable to the topological Hall 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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