论文标题
由单轴helimagnets中极化电流驱动的手性孤子动力学
Dynamics of chiral solitons driven by polarized currents in monoaxial helimagnets
论文作者
论文摘要
手性孤子是一维局部磁性结构，在某些具有dzyaloshinskii-Moriya相互作用和/或单轴磁各向异性的铁磁系统中具有亚稳定性。尽管通常，拓扑纹理为新的Spintronics现象提供了一个非常有趣的操场，但是如何正确创建和控制单手性孤子仍然尚不清楚。我们在这里表明，单轴helimagnets中的手性孤子可以用外部磁场稳定为单轴dzyaloshinskii-moriya相互作用。一旦创建，只要诱导的自旋转移扭矩具有耗散性（非绝热）组件，孤子就会响应偏振电流稳定移动。孤子的结构以稳定运动的方式存在于施加的电流密度，仅当应用电流密度低于临界值而不是临界值，超出该值不再稳定。
Chiral solitons are one dimensional localized magnetic structures that are metastable in some ferromagnetic systems with Dzyaloshinskii-Moriya interactions and/or uniaxial magnetic anisotropy. Though topological textures in general provide a very interesting playground for new spintronics phenomena, how to properly create and control single chiral solitons is still unclear. We show here that chiral solitons in monoaxial helimagnets, characterized by a uniaxial Dzyaloshinskii-Moriya interaction, can be stabilized with external magnetic fields. Once created, the soliton moves steadily in response to a polarized electric current, provided the induced spin-transfer torque has a dissipative (nonadiabatic) component. The structure of the soliton depends on the applied current density in such a way that steady motion exists only if the applied current density is lower than a critical value, beyond which the soliton is no longer stable.
