Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Nanostructures at Surfaces: Molecular Systems II
O 97.7: Vortrag
Donnerstag, 23. März 2017, 17:00–17:15, REC/PHY C213
Growth of Tm-based organometallic nanostructures on Gr/Ir(111) — •Stefan Kraus1, Felix Huttmann1, Nico Rothenbach2, Katharina Ollefs2, Lucas M. Arruda3, Wolfgang Kuch3, Heiko Wende2, and Thomas Michely1 — 1Universität zu Köln, Germany — 2Universität Duisburg-Essen, Germany — 3Freie Universität Berlin, Germany
Organometallic compounds containing rare earth elements are of interest in molecular spintronics owing to the robust magnetic moment of the 4f ion. Here, we combine the lanthanide Tm with the organic molecule cyclooctatetraene (Cot) for the growth of organometallic nanostructures on Gr/Ir(111), obtaining three distinct phases (1)–(3). Synthesis on the undoped substrate yields (1) a disperse phase of repulsively interacting adsorbates. Based on its punctiform appearance it is presumed to consist of TmCot monomers which are stabilized by charge transfer into the substrate leading to a Coulomb repulsion between them. When surpassing a coverage of about 2% ML, (2) an island-forming “coffee bean” phase condenses out of (1) and coexists with it. Formation of (1) and (2) is inhibited by n doping of graphene via intercalation as further charge transfer is suppressed. Rather, synthesis on the doped substrate results in the formation of (3) sandwich-molecular wires growing in islands. Tuning the Tm/Cot ratio during growth controlls the achievable wire length, in some islands exceeding 100 Tm ions per wire. Magnetic anisotropy from the action of the Cot ligand field on the Tm ion and the differing Tm separations in each phase are expected to yield a rich spectrum of magnetic properties.