title: Self-Organized Growth, Structure, and Magnetism of Monatomic Transition-Metal Oxide Chains.
abstract: We report on the self-organized growth of monatomic transition-metal oxide chains of (3×1) periodicity and unusual MO_{2} stoichiometry (M=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 NiO_{2} chains are nonmagnetic, CoO_{2} chains are ferromagnetic, while FeO_{2} and MnO_{2} 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.
authors: Lehrstuhl für Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors: Pascal
authors: P
authors: Ferstl
authors: Lehrstuhl für Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors: Lutz
authors: L
authors: Hammer
authors: Lehrstuhl für Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors: Christopher
authors: C
authors: Sobel
authors: Lehrstuhl für Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors: Matthias
authors: M
authors: Gubo
authors: Lehrstuhl für Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors: Klaus
authors: K
authors: Heinz
authors: Lehrstuhl für Festkörperphysik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
authors: M Alexander
authors: MA
authors: Schneider
authors: Institut für Angewandte Physik and Center for Computational Materials Science, Technische Universität Wien, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria.
authors: Florian
authors: F
authors: Mittendorfer
authors: Institut für Angewandte Physik and Center for Computational Materials Science, Technische Universität Wien, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria.
authors: Josef
authors: J
authors: Redinger