SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Focus Session: Higher-Order Magnetic Interactions - Implications in 2D and 3D Magnetism II

MA 14.4: Vortrag

Donnerstag, 30. September 2021, 14:30–14:45, H5

Spontaneous atomic-scale hexagonal spin lattices driven by higher-order exchange interactions — •Mara Gutzeit¹, André Kubetzka², Soumyajyoti Haldar¹, Henning Pralow¹, 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, 20355 Hamburg, Germany

Higher-order exchange interactions (HOI) beyond the pair-wise Heisenberg exchange can be the origin of a variety of complex magnetic structures such as conical spin spirals [1], multi-Q states [2,3], or nanoskyrmion lattices [4]. Here, using spin-polarized scanning tunneling microscopy we explore uniaxial spin states as well as two-dimensionally modulated spin structures in ultrathin Fe/Rh films on the Ir(111) surface. Density functional theory calculations elucidate how HOI stabilize spontaneous atomic-scale hexagonal spin lattices exhibiting only a small deviation from collinearity in these systems which are characterized by a weak Dzyaloshinskii-Moriya interaction. We demonstrate that a subtle interplay of HOI is responsible for the transition between different magnetic ground states.

[1] Yoshida et al. PRL 108, 087205 (2012)

[2] Krönlein et al. PRL 120, 207202 (2018)

[3] Spethmann et al. PRL 124, 227203 (2020)

[4] Heinze et al. Nat. Phys. 7, 713 (2011)