Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Surface Magnetism
MA 46.9: Talk
Friday, March 21, 2025, 11:45–12:00, H19
Antiferromagnetic merons in a Mn monolayer on Ta(110) — •Tim Drevelow1, Felix Zahner2, André Kubetzka2, Roland Wiesendanger2, Stefan Heinze1, and Kirsten von Bergmann2 — 1Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstraße 15, 24098 Kiel, Germany — 2Department of Physics, University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany
Non-collinear topological spin structures in ultrathin transition-metal films are interesting for spintronic applications. When hosted in antiferromagnets, they are robust to external perturbations, possess vanishing demagnetization fields, and the Skyrmion-Hall effect does not occur. Ultrathin Mn-layers are intrinsically antiferromagnetic and exhibit non-collinear spin structures, such as the conical spin structure in Mn on W(110) [1]. Here, using spin-polarized scanning tunneling microscopy and density functional theory, we discover a cycloidal spin spiral and a c(2 × 2) antiferromagnet in Mn mono- and double-layers on the Ta(110) surface, respectively. Micromagnetic simulations on the sublattice reveal a transition of spin spirals into antiferromagnetic, meronic spin structures of non-trivial topology near the interface to the collinear antiferromagnet of the film due to competing anisotropies of the Mn mono- and double-layer.
[1] Yoshida et al. Phys. Rev. Lett. 108, 087205 (2012)
Keywords: density functional theory; magnetic merons; antiferromagnetism; ultrathin films; micromagnetic model