Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Poster Surface Magnetism

O 19.1: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Studying Higher-Order Interaction Driven Non-Coplanar Spin Structures Using SP-STM — •Arved Heilmann, Roland Wiesendanger, and Kirsten von Bergmann — Universität Hamburg, Germany

Complex magnetic order arises from competing interactions between magnetic moments. Higher-order interactions (HOI), involving more than two spins, can lead to three-dimensional magnetic configurations known as multi-Q states. Spin-polarized scanning tunneling microscopy (SP-STM) is a powerful tool for studying these systems, enabling real-space imaging of atomic-scale magnetic structures. HOI-driven hexagonal 3Q states have been observed at the atomic and nanoscale in Rh/Mn/Re(0001) and Fe/Rh/Ir(111), respectively [1,2].

To identify further HOI-driven magnetic states, we investigate other systems with Mn/Rh and Fe/Rh interfaces grown on Re(0001). Our findings reveal distinct spin structures that depend on the layer sequence of the pseudomorphic layers. Mn monolayers grown on single or double Rh layers form the Néel state, while Mn grown directly onto the substrate exhibits a non-coplanar 3Q state [3]. For Fe, deposition on two Rh layers results in a distorted quasi-hexagonal magnetic lattice, contrasting with the substrate’s ideal hexagonal symmetry. This two-dimensional modulation of the spin texture suggests it also arises from HOI.

[1] F. Nickel, et al., Phys. Rev. B 108, L180411 (2023).

[2] M. Gutzeit, et al., Nat. Commun. 13, 5764 (2022).

[3] J. Spethmann, et al, Phys. Rev. Lett. 124, 227203 (2020).

Keywords: Complex Magnetic Order; SP-STM; Multi-Q states; Non-coplanar Spin Structures; Higher-Order Interactions