In this paper we investigate a magnetic racetrack consisting of a junction of three materials with different properties. Indeed, this magnetic system is composed by two distinct regions (racetracks) connected by a thin interface: the first region (termed sector $1$) has isotropic in-plane magnetic chirality and supports skyrmion ($S$) excitations while the second (sector $3$) has anisotropic chirality and consequently supports antiskyrmions ($A$). The interface, which would be a third region (sector $2$, connecting sectors $1$ and $3$) located in the central part of the racetrack, is an easy-axis Heisenberg ferromagnetic material. The topological structures $S$ and $A$ are put in motion by applying a spin-polarized current. Under certain conditions, we show that the skyrmion and the antiskyrmion created in their respective sectors are simultaneously impelled to the interface (due to the Magnus force) to apparently become a unique object (a skyrmion-antiskyrmion pair or $SAP$). After glued by sector $2$, the skyrmion and the antiskyrmion move together (as a $SAP$) along the direction of the applied current. It is also shown that such an engineered racetrack can support a sequence of several $SAP$ structures in motion, forming a current.

中文翻译：

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马格努斯力在非均匀跑道中诱导 Skyrmion-Antiskyrmion 耦合

在本文中，我们研究了由具有不同特性的三种材料的结组成的磁性跑道。事实上，这个磁系统由两个不同的区域（跑道）组成，它们通过薄界面连接：第一个区域（称为扇区 $1$）具有各向同性的平面内磁手性并支持斯格明子（$S$）激发，而第二个区域（扇区 $1$） $3$) 具有各向异性手性，因此支持 antiskyrmions ($A$)。该界面将是位于赛道中心部分的第三个区域（扇区 $2$，连接扇区 $1$ 和 $3$），是易轴 Heisenberg 铁磁材料。通过施加自旋极化电流，拓扑结构 $S$ 和 $A$ 开始运动。在一定条件下，我们表明，在各自扇区中创建的 skyrmion 和 antiskyrmion 同时被推动到界面（由于 Magnus 力），显然成为一个独特的对象（skyrmion-antiskyrmion 对或 $SAP$）。在被扇区 $2$ 粘合后，skyrmion 和 antiskyrmion 沿着施加电流的方向一起移动（作为 $SAP$）。还表明，这样的工程跑道可以支持一系列运动中的 $SAP$ 结构，形成电流。