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APS -2017 Annual Meeting of the APS Mid-Atlantic Section- Event - Dynamics of antiferromagnetic solitons

机译:APS -2017年APS大西洋中部分会年会-事件-反铁磁孤子的动力学

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We study the dynamics of topological solitons in antiferromagnets using a Lagrangian formalism constructed in terms of collective coordinates representing the soft modes of the defect. We adopt a procedure by which we can effectively study the interplay of internal exchange fields and external fields (magnetic and spin current) which allows us to determine whether solitons can be moved and under what conditions. In our investigation we consider the examples of one dimensional domain walls and planar vortices focusing on their dynamics. It turns out that to effectively move the soliton either a finite ferromagnetic moment has to be induced through an asymmetric exchange, or there must be internal forces exerting a static friction on the defect. We also outline a procedure, using a crossed magnetic (out of plane) and spin current field, by which one can move antiferromagnet vortices in planar geometries without the requirement of an asymmetric exchange.
机译:我们使用代表缺陷软模式的集体坐标构造的拉格朗日形式主义研究反铁磁体中拓扑孤子的动力学。我们采用一种程序,通过该程序,我们可以有效地研究内部交换场和外部场(磁场和自旋电流)之间的相互作用,从而可以确定孤子是否可以移动以及在什么条件下可以移动。在我们的研究中,我们考虑一维畴壁和平面涡流的实例,重点关注它们的动力学。事实证明,要有效地移动孤子,要么必须通过非对称交换来感应有限的铁磁矩,要么必须存在内部力在缺陷上施加静摩擦。我们还概述了使用交叉磁场(平面外)和自旋电流场的过程,通过该过程,可以在不对称交换的情况下以平面几何形状移动反铁磁涡流。

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