Publications in Scientific Journals:
P. Ferstl, L. Hammer, C. Sobel, M. Gubo, K. Heinz, M. Schneider, F. Mittendorfer, J. Redinger:
"Self-Organized Growth, Structure, and Magnetism of Monatomic Transition-Metal Oxide Chains";
Physical Review Letters,
We report on the self-organized growth of monatomic transition-metal oxide chains of (3 × 1)
periodicity and unusual MO2 stoichiometry (M ¼ Ni, Co, Fe, Mn) on Ir(100). We analyze their structural
and magnetic properties by means of quantitative LEED, STM, and density functional theory (DFT)
calculations. LEED analyses reveal a fascinating common atomic structure in which the transition-metal
atoms sit above a missing-row structure of the surface and are coupled to the substrate only via oxygen
atoms. This structure is confirmed by DFT calculations with structural parameters deviating by less
than 1.7 pm. The DFT calculations predict that the NiO2 chains are nonmagnetic, CoO2 chains are
ferromagnetic, while FeO2 and MnO2 are antiferromagnetic. All structures show only weak magnetic
interchain coupling. Further, we demonstrate the growth of oxide chains of binary alloys of Co and Ni or Fe
on Ir(100), which allows us to produce well-controlled ensembles of ferromagnetic chains of different
lengths separated by nonmagnetic or antiferromagnetic segments.
Created from the Publication Database of the Vienna University of Technology.