SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Posters Magnetism II

MA 5.16: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Topological-chiral magnetic interactions in ultrathin films at surfaces — •Soumyajyoti Haldar¹, Sebastian Meyer², André Kubetzka³, and Stefan Heinze¹ — ¹Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstr. 15, 24098 Kiel, Germany — ²Nanomat/Q-mat/CESAM, Université de Liège, B-4000 Sart Tilman, Belgium — ³Department of Physics, University of Hamburg, 20355 Hamburg, Germany

Non-collinear spin structures are of fundamental interest in magnetism since they allow to obtain insight into the underlying microscopic interactions and are promising for spintronic applications [1,2]. Here, we demonstrate that recently proposed topological-chiral magnetic interactions [3] can play a key role for magnetic ground states in ultrathin films at surfaces [4]. Based on density functional theory we show that significant chiral-chiral interactions occur in hexagonal Mn monolayers due to large topological orbital moments which interact with the emergent magnetic field. Due to the competition with higher-order exchange interactions superposition states of spin spirals such as the 2Q state or a distorted 3Q state can arise. Simulations of spin-polarized scanning tunneling microscopy images suggest that the distorted 3Q state could be the magnetic ground state of a Mn monolayer on Re(0001).
[1] A. Fert et al., Nat. Rev. Mater. 2, 17031 (2017). [2] J. Grollier et al., Nat. Electron. 3, 360 (2020). [3] S. Grytsiuk et al., Nat. Commun. 11, 511 (2020). [4] S. Haldar et al., arXiv:2106.08622 (2021).