Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Surface Magnetism

MA 30.6: Talk

Thursday, September 8, 2022, 10:45–11:00, H48

Distorted 3Q state driven by topological-chiral magnetic interaction — •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]. Using 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. Superposition states of spin spirals such as the 2Q state or a distorted 3Q state arise due to the competition with biquadratic and four-spin interactions. 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., Phys. Rev. B 104 L180404 (2021).