Bhattacharjee Satadeep, Lee Seung-Cheol
Indo-Korea Science and Technology Center (IKST), Bangalore, India.
Electronic Materials Research Center, Korea Institute of Science & Technology, Seoul, Republic of Korea.
J Phys Condens Matter. 2023 Aug 2;35(43). doi: 10.1088/1361-648X/acea10.
A new method for analyzing 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 velocitywith a non-negligible value ofv/c(whereis 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.
一种用于分析在诸如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的新方法已被提出。这些以v/c（其中c是光速）的不可忽略值的速度行进的电子，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。当这个产生的偶极矩与自旋纹理区域中的规范场相互作用时，会产生一个有效场，该有效场产生自旋扭矩。这些扭矩，类似于当电子从重金属注入铁磁体时发生的自旋轨道扭矩，可以表现出类似阻尼和反阻尼的特性。最后，我们证明偶极矩与规范场之间的这种相互作用引入了一个反常速度，该速度可以以与拓扑霍尔效应相当的方式对自旋纹理中的横向电导率做出贡献。
