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arXiv 2007.07123cond-mat.str-el
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极化电流驱动下单轴螺旋磁网络中手征孤子的动力学

Dynamics of chiral solitons driven by polarized currents in monoaxial helimagnets

Victor Laliena, Sebastian Bustingorry, Javier Campo

摘要:

手征孤子是一类存在于具有Dzyaloshinskiii-Moriya相互作用和单轴磁各向异性的铁磁系统中的亚稳态一维局域磁结构。虽然拓扑纹理为新的自旋电子学现象提供了一个非常有趣的场所,但如何正确地产生和控制单手征孤子仍然不清楚。我们在这里表明,手征孤子的单轴helimagnets,其特征在于单轴Dzyaloshinskiii-Moriya相互作用,可以稳定与外部磁场。一旦产生,孤子响应于极化电流稳定地移动,只要诱导的自旋转移力矩具有耗散(非绝热)分量。孤子的结构依赖于所施加的电流密度,只有当所施加的电流密度低于临界值时,才存在稳定的运动,超过该临界值,孤子不再稳定。

英文摘要:

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.

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