%0 Journal Article
%A Romming, Niklas
%A Pralow, Henning
%A Kubetzka, André
%A Hoffmann, Markus
%A von Malottki, Stephan
%A Meyer, Sebastian
%A Dupé, Bertrand
%A Wiesendanger, Roland
%A von Bergmann, Kirsten
%A Heinze, Stefan
%T Competition of Dzyaloshinskii-Moriya and Higher-Order Exchange Interactions in Rh/Fe Atomic Bilayers on Ir(111)
%J Physical review letters
%V 120
%N 20
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2018-07519
%P 207201
%D 2018
%X Using spin-polarized scanning tunneling microscopy and density functional theory we demonstrate the occurrence of a novel type of noncollinear spin structure in Rh/Fe atomic bilayers on Ir(111). We find that higher-order exchange interactions depend sensitively on the stacking sequence. For fcc-Rh/Fe/Ir(111), frustrated exchange interactions are dominant and lead to the formation of a spin spiral ground state with a period of about 1.5 nm. For hcp-Rh/Fe/Ir(111), higher-order exchange interactions favor an up-up-down-down (↑↑↓↓) state. However, the Dzyaloshinskii-Moriya interaction at the Fe/Ir interface leads to a small angle of about 4° between adjacent magnetic moments resulting in a canted ↑↑↓↓ ground state.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:29864327
%U <Go to ISI:>//WOS:000432992600006
%R 10.1103/PhysRevLett.120.207201
%U https://juser.fz-juelich.de/record/858674