Fig. 3: Magnetic states of Fe/Rh2.
From: Nano-scale collinear multi-Q states driven by higher-order interactions
a Overview SP-STM image (partially differentiated constant-current data) of Fe/Rh/Ir(111). b Constant-current images of the a-Fe/Rh2 island indicated in the overview image (rotated with respect to the overview image; note that near the middle of the island a rotational domain has switched direction during imaging (left image, horizontal scan lines)); the two insets show calculated SP-STM images based on the local vacuum density of states of the uudd state with different spin-polarization of the tip, see Supplementary Fig. 3 for details; while for the two STM images we cannot derive the size of the respective spin-polarization of the tunnel current, the comparison with the calculated STM images suggests that it is negligible for the right measurement. c Constant-current images of a b-Fe/Rh2 island before and after moving the central adsorbed cluster (this is the island in the bottom right of the overview image, rotated with respect to the overview image). d, e Sketches of possible magnetic states with the experimentally determined unit cells; for details on the construction of these magnetic states see methods section and for SP-STM simulations see Supplementary Figs. 1,2. (Measurement parameters: a U = +15 mV, I = 3.3 nA; b, left U = +41 mV, I = 2.8 nA, right U = + 4mV, I = 5.1 nA; c, left U = +10 mV, I = 3.3 nA, right U = +11 mV, I = 2.0 nA, inset U = + 34mV, I = 5.3 nA; all: B = −4 T, T = 4.2 K; Cr-bulk tip sensitive to out-of-plane sample magnetization components, as deduced from the observed magnetic contrast and symmetry considerations; the height range of the images is given in pm.).
