Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Non-Skyrmionic Magnetic Textures

MA 10.1: Hauptvortrag

Montag, 5. September 2022, 15:00–15:30, H47

Magnetic vortices: into the third dimension — •Sebastian Gliga — Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland

Vortices are familiar phenomena in fluids and gases. In ferromagnets, they are naturally forming flux-closure states characterized by a curling of the magnetization around a very stable and narrow core. Over the past decades, vortex structures have been extensively studied in laterally confined thin-film elements owing to their rich dynamics [1].

Recently, non-destructive imaging of three-dimensional magnetic structures at the nanoscale has become possible. Using hard X-ray tomography [2], we have uncovered three-dimensional structures forming closed vortex loops in a bulk magnet. Based on magnetic vorticity (a quantity analogous to hydrodynamic vorticity), we identified these configurations as magnetic vortex rings [3]. In contrast to theoretical predictions, the observed vortex rings exist as static configurations, rather than purely dynamic states.

Our results open possibilities for further studies of complex three-dimensional solitons.

[1] R. Hertel, S. Gliga, M. Fähnle, and C. M. Schneider, Phys. Rev. Lett. 98, 117201 (2007)

[2] C. Donnelly, M. Guizar-Sicairos, V. Scagnoli, S. Gliga, M. Holler, J. Raabe, L. J. Heyderman, Nature 547, 328-331 (2017)

[3] C. Donnelly, K. L. Metlov, V. Scagnoli, M. Guizar-Sicairos, M. Holler, N. S. Bingham, J. Raabe, L. J. Heyderman, N. R. Cooper, S. Gliga, Nature Physics 17, 316-321 (2021)