Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Skyrmions III

MA 55.11: Talk

Friday, March 13, 2026, 12:15–12:30, HSZ/0004

Exchange striction model calculations for the skyrmion-containing compound Gd₃Ru₄Al₁₂ — •Justus Grumbach¹, Martin Rotter², and Mathias Doerr¹ — ¹Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany — ²McPhase Project, Sestiere Cannaregio 2904, 30121 Venezia, Italy

For the compound Gd₃Ru₄Al₁₂, we measured the complete dilatometric tensor, enabling a refinement of the phase diagrams in all crystallographic directions (see also the talk by M. Doerr). The most prominent feature is a lattice effect indicating a coupling of skyrmions to the crystal lattice, as previously evidenced by a docking of the propagation vector onto the crystal lattice. In the simulations, an approach for calculating the exchange striction was implemented that takes volume-influences into account and is particularly suitable for Gd-based compounds. Major aspects supporting our experimental results could be reproduced. The presentation will outline the full simulation process - from modeling, through the calculation of general magnetostrictive effects, to the influence of skyrmions - and conclude with a discussion of the volume effect in the skyrmion phase.

Keywords: Magnetostriction; Skyrmions; Simulation; Thermodynamics