As topological quasi-particles in magnetic materials, skyrmions and antiskyrmions show potential in spintronics for information storage and computing. However, effectively controlling and separating these entities remain significantly challenging. Here, we demonstrate that anisotropic Kitaev exchange can distinctly influence the static and dynamic behaviors for skyrmions and antiskyrmions, thus aiding their manipulation and separation. Employing the monolayer frustrated magnet NiBr₂ as a model system, we construct a magnetic field–strain phase diagram to explore the strain-controlled stability of these topological structures. The introduction of the Kitaev term breaks the energy degeneracy among magnetic structures with various helicities, leading to a translation–rotation mode transition with an increase in current. Importantly, due to their different rotational symmetries, the skyrmion and antiskyrmion show distinct critical behaviors and rotational dynamics, which are governed by the Kitaev parameters. These phenomena enable the design of two proof-of-concept spintronics devices, i.e., a skyrmion separator and a non-gate logic unit.

中文翻译：

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通过 Kitaev 相互作用对 Skyrmion 和 Antiskyrmion 进行受控分离


作为磁性材料中的拓扑准粒子，斯格明子和反斯格明子在自旋电子学中显示出用于信息存储和计算的潜力。然而，有效控制和分离这些实体仍然极具挑战性。在这里，我们证明了各向异性 Kitaev 交换可以明显影响 skyrmion 和 antiskyrmions 的静态和动态行为，从而有助于它们的操纵和分离。采用单层受挫磁体 NiBr₂ 作为模型系统，我们构建了磁场-应变相位图，以探索这些拓扑结构的应变控制稳定性。Kitaev 项的引入打破了具有不同螺旋度的磁性结构之间的能量简并性，导致随着电流的增加而发生平移-旋转模式转变。重要的是，由于它们的旋转对称性不同，斯格明子和反斯格明子表现出不同的临界行为和旋转动力学，这些行为和旋转动力学受 Kitaev 参数控制。这些现象使两个概念验证的自旋电子器件的设计成为可能，即一个斯格明子分离器和一个非门逻辑单元。