Skyrmion flow in periodically modulated channels

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 expl...

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Bibliographic Details
Published in:arXiv.org 2024-03
Main Authors: Raab, Klaus, Schmitt, Maurice, Brems, Maarten A, Rothörl, Jan, Kammerbauer, Fabian, Krishnia, Sachin, Kläui, Mathias, Virnau, Peter
Format: Article
Language:English
Subjects:
Boundary conditions
Elementary excitations
Flow profiles
Hall effect
Hypothetical particles
Liquid flow
Magnetic properties
Particle theory
Thin films
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Summary: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.
ISSN:2331-8422