SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Surface Magnetism
MA 14.3: Vortrag
Dienstag, 28. März 2023, 10:15–10:30, HSZ 04
Lifting the frustration of higher-order exchange interactions in ultrathin films — •Felix Nickel1, Soumyajyoti Haldar1, Roland Wiesendanger2, Stefan Heinze1, and Kirsten von Bergmann2 — 1Institute of Theoretical Physics and Astrophysics, University of Kiel — 2Department of Physics, University of Hamburg
The 3Q state – a three-dimensional spin structure on a two-dimensional
lattice predicted about 20 years ago [1] – has been observed in a Mn
monolayer on Re(0001) using spin-polarized scanning tunneling microscopy (SP-STM) [2].
The 3Q state is a superposition of three symmetry equivalent spin spirals
with the same period and can be stabilized by higher-order exchange
interactions (HOI) such as the biquadratic or four-spin interactions
[1,2].
Recently, it has been suggested based on density functional theory (DFT) calculations
that the 3Q state in Mn/Re(0001) is significantly distorted due to
topological chiral magnetic interactions [3].
Here, we show using DFT that the competition of biquadratic,
four-spin, and topological chiral interactions
can be tuned in Mn/Re(0001) by single atomic adlayers of Pd or Rh.
Thereby, the frustration of HOI present in Mn/Re(0001) is lifted which
results in the occurrence of the ideal 3Q state.
SP-STM experiments confirm the predicted 3Q ground state
of Pd/Mn/Re(0001) and Rh/Mn/Re(0001) and reveal differences to Mn/Re(0001).
[1] Ph. Kurz et al., Phys. Rev. Lett. 86, 1106 (2001)
[2] J. Spethmann et al.,
Phys. Rev. Lett. 124, 227203 (2020)
[3] S. Haldar et al., Phys. Rev. B 104, L180404 (2021)