Fig. 4: DFT total energies for various spin structures in Fe/Rh/Ir(111).
From: Nano-scale collinear multi-Q states driven by higher-order interactions
a, b Energy dispersion E(q) of flat cycloidal spin spirals for fcc-Fe/Rh/Ir(111) and hcp-Fe/Rh/Ir(111), respectively, calculated by means of DFT along the two high-symmetry directions of the two-dimensional Brillouin zone. The black circles denote DFT total energies including spin–orbit coupling (SOC), i.e., the DMI and MAE. Black lines represent a fit to the Heisenberg model including the contributions of DMI and MAE. The DFT total energies of the spin structures given in d–i are shown by symbols at the q-values of the respective 1Q states as indicated in the figure. c–i Sketches of the considered spin structures, their magnetic unit cells are indicated.
