Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Frustrated Magnets I
MA 21.4: Talk
Wednesday, March 19, 2025, 10:15–10:30, H18
Geometric design of frustrated magnetic textures in ferrotoroidal spin chains — •Oleksandr V. Pylypovskyi1, Enrico Di Benedetto2, Carmine Ortix3, and Denys Makarov1 — 1Helmholtz-Zentrum Dresden-Rossendorf e.V., 01328 Dresden, Germany — 2Università degli Studi di Palermo, 90123 Palermo, Italy — 3Università di Salerno, IT-84084 Fisciano (SA), Italy
Design of geometric shapes in magnetic nanosystems provides a possibility to tune their magnetic responses [1] and even enable multiferroicity by a finite geometry-driven toroidal moment [2]. Here, we consider the effects of ring-like geometries with a constant torsion on properties of 3D ferro- (FM) and antiferromagnetic (AFM) spin chains. Their magnetic state is primarily determined by the knots in geometry with a high curvature, which corresponds to a localized geometry-driven Dzyaloshinskii–Moriya interaction (DMI). This DMI favors the twist of the order parameter at the knot. For the AFM chains with even and odd number of spins, the number of knots in their geometry allows designing the ground-state magnetic texture characteristic either for the spin system with or without geometric frustration. While the FM chains with the easy tangential axis of magnetization host a large toroidal moment for the whole sample, AFM hard-axis chains split into toroidal domains by geometric knots. To conclude, the localized geometry-driven DMI offers a possibility to design frustrated magnetic textures in spin chains.
[1] D. Makarov et al., Adv. Mater. 34, 2101758 (2022). [2] C. Ortix, J. van den Brink, Phys. Rev. Research, 5, L022063 (2023).
Keywords: spin chains; constant torsion; ferrotoroidicity; frustration