Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Skyrmions III
MA 55.3: Talk
Friday, March 13, 2026, 10:00–10:15, HSZ/0004
Dipolar Skyrmion Continuum Mechanics — •Kilian Leutner1, Klaus Raab1, Grischa Beneke1, Duc M. Tran1, Sachin Krishnia1, Robert Frömter1, and Mathias Kläui1,2 — 1Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany — 2Center for Quantum Spintronics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Magnetic skyrmions–topological quasiparticle spin textures–offer a platform for both fundamental physics and applications [1]. In multilayer films, micrometer-scale skyrmions can emerge from dipolar interactions, and describing the long-timescale behavior of an ensemble requires multiscale modeling. We extend the Thiele equation by treating the skyrmion radius as a dynamic variable and derive the forces governing changes in both position and size from micromagnetic theory. As a novel approach to describe ensemble dynamics, we develop a continuum-mechanics framework in which individual skyrmions are replaced by macroscopic fields such as density, velocity, and radius. The equation of state required for this description–relating pressure and density in the basic case–is calculated using dipolar-lattice theory [2]. We validate these two theoretical frameworks by examining how a spin-orbit torque compresses a skyrmion lattice in a Ta/CoFeB/MgO wire in an experiment. The continuum-mechanics model provides deeper insight into dipolar skyrmion ensembles as a hyperelastic medium composed of interacting particles of variable size.
[1] C. Back et al. J. Phys. D: Appl. Phys., 53, 363001 (2020).
[2] E. M. Jefremovas, K. Leutner et al. Newton, 1, 100036 (2025).
Keywords: Skyrmionics; Spintronics; Continuum mechanics; Multiscale modelling; Hyperelasticity