SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.52: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Spontaneous nanoscale square vs. hexagonal skyrmion lattices in Fe/Ir(111) — •Mara Gutzeit, Soumyajyoti Haldar, Tim Drevelow, Moritz A. Goerzen, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstraße 15, 24098 Kiel, Germany

We investigate the occurrence of spontaneous skyrmion lattices in an Fe monolayer in both fcc and hcp stacking on the Ir(111) surface employing first-principles calculations based on density functional theory (DFT). For fcc-Fe the well-known non-collinear square nanoskyrmion lattice is confirmed as the magnetic ground state [1]. Surprisingly, for hcp-Fe a nearly collinear hexagonal multi-Q state turns out energetically more favourable than the hexagonal skyrmion lattice proposed based on spin-polarized scanning tunneling microscopy experiments [2]. By mapping total DFT energies of a variety of complex magnetic structures to an atomistic spin model we reveal the interplay of pairwise Heisenberg exchange, Dzyaloshinskii-Moriya interaction and higher-order exchange interactions to be responsible for the symmetry and the degree of collinearity of the respective spin lattice.

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

[2] von Bergmann et al. Nano Lett. 15, 3280 (2015)