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arXiv · 2403.07397

Skyrmion flow in periodically modulated channels

Klaus Raab·Maurice Schmitt·Maarten A. Brems·Jan Rothörl·Fabian Kammerbauer·Sachin Krishnia·Mathias Kläui·Peter Virnau
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Abstract

Magnetic skyrmions, topologically stabilized chiral magnetic textures with particle-like properties have so far primarily been studied statically. Here, we experimentally investigate the dynamics of skyrmion ensembles in metallic thin film conduits where they behave as quasi-particle fluids. By exploiting our access to the full trajectories of all fluid particles by means of time-resolved magneto-optical Kerr microscopy, we demonstrate that boundary conditions of skyrmion fluids can be tuned by modulation of the channel geometry. We observe as a function of channel width deviations from classical flow profiles even into the no- or partial-slip regime. Unlike conventional colloids, the skyrmion Hall effect can also introduce transversal flow-asymmetries and even local motion of single skyrmions against the driving force which we explore with particle-based simulations, demonstrating the unique properties of skyrmion liquid flow that uniquely deviates from previously known behavior of other quasi-particles.

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Klaus Raab, Maurice Schmitt, Maarten A. Brems, Jan Rothörl, Fabian Kammerbauer, Sachin Krishnia, Mathias Kläui, Peter Virnau. 2024-03-12. Skyrmion flow in periodically modulated channels. https://arxiv.org/abs/2403.07397

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