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In this paper we investigate a magnetic racetrack consisting of a junction ofthree materials with different properties. Indeed, this magnetic system iscomposed by two distinct regions (racetracks) connected by a thin interface:the first region (termed sector $1$) has isotropic in-plane magnetic chiralityand supports skyrmion ($S$) excitations while the second (sector $3$) hasanisotropic chirality and consequently supports antiskyrmions ($A$). Theinterface, which would be a third region (sector $2$, connecting sectors $1$and $3$) located in the central part of the racetrack, is an easy-axisHeisenberg ferromagnetic material. The topological structures $S$ and $A$ areput in motion by applying a spin-polarized current. Under certain conditions,we show that the skyrmion and the antiskyrmion created in their respectivesectors 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 (asa $SAP$) along the direction of the applied current. It is also shown that suchan engineered racetrack can support a sequence of several $SAP$ structures inmotion, forming a current.

Topological Hall effect induced Skyrmion-Antiskyrmion coupling in inhomogeneous racetrack