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Topologically distinct magnetic structures like skyrmions, domain walls, andthe uniformly magnetized state have multiple applications in logic devices,sensors, and as bits of information. One of the most promising concepts forapplying these bits is the racetrack architecture controlled by electriccurrents or magnetic driving fields. In state-of-the-art racetracks, thesefields or currents are applied to the whole circuit. Here, we employmicromagnetic and atomistic simulations to establish a concept for racetrackmemories free of global driving forces. Surprisingly, we realize that mixedsequences of topologically distinct objects can be created and propagated overfar distances exclusively by local rotation of magnetization at the sampleboundaries. We reveal the dependence between the chirality of the rotation andthe direction of propagation and define the phase space where the proposedprocedure can be realized. The advantages of this approach are the exclusion ofhigh current and field densities as well as its compatibility with anenergy-efficient three-dimensional design.

Rotating edge-field driven processing of chiral spin textures in racetrack devices