Edge states and skyrmion dynamics in nanostripes of frustrated magnets

TL;DR

This paper investigates how complex edge states in frustrated magnetic nanostripes influence skyrmion and antiskyrmion dynamics, revealing new mechanisms for controlling their motion and interactions with potential applications in electronic devices.

Contribution

It demonstrates that edge states in frustrated magnets create multiple guiding channels and complex dynamics for skyrmions, enabling control over their behavior via electric currents.

Findings

Edge states form multiple channels guiding skyrmion motion.

Complex edge topology leads to emission of skyrmion-antiskyrmion pairs.

Electric currents can control skyrmion interactions at edges.

Abstract

Magnetic skyrmions are particle-like topological excitations recently discovered in chiral magnets. Their small size, topological protection and the ease with which they can be manipulated by electric currents generated much interest in using skyrmions for information storage and processing. Recently, it was suggested that skyrmions with additional degrees of freedom can exist in magnetically frustrated materials. Here, we show that dynamics of skyrmions and antiskyrmions in nanostripes of frustrated magnets is strongly affected by complex spin states formed at the stripe edges. These states create multiple edge channels which guide the skyrmion motion. Non-trivial topology of edge states gives rise to complex current-induced dynamics, such as emission of skyrmion-antiskyrmion pairs. The edge state topology can be controlled with an electric current through the exchange of skyrmions and antiskyrmions between the edges of a magnetic nanostructure. These results can lead to conceptually new electronic devices.