Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.20: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster C

Multi-Q state emerging from frustrated interlayer exchange interaction — •Bjarne Beyer, Mara Gutzeit, Moritz A. Goerzen, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, University of Kiel, Germany

Superpositions of spin spirals, so-called multi-Q states, are complex spin structures which are of fundamental interest and promising for future spintronic applications. A prominent example is the triple-Q state predicted more than 20 years ago [1] and recently observed in ultrathin Mn films on surfaces [2,3]. Superposition states are energet- ically degenerate with the corresponding single-Q (spin spiral) states within the Heisenberg model, however, higher-order exchange interac- tions can lift this degeneracy [1]. Here we propose a three-dimensional multi-Q state in a Mn bilayer that is stabilised by frustrated interlayer exchange interactions. Our study combines ab initio calculations via density functional theory, atomistic spin simulations as well as Fourier analysis and simulation of spin-polarized scanning tunneling microscopy images.

[1] P. Kurz et al., PRL 86, 1106 (2001).
[2] J. Spethmann et al., PRL 124, 227203 (2020).
[3] F. Nickel et al., PRB (in press) and arxiv:2307.09764 (2023).

Keywords: Multi-Q state; Magnetic bilayer systems; Frustrated exchange