Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 100: Metal Substrates: Adsorption and Reactivity
O 100.1: Vortrag
Freitag, 20. März 2015, 10:30–10:45, MA 043
Metallocene adsorption and customization on copper — •Nicolas Bachellier1, Maider Ormaza1, Paula Abufager2, Roberto Robles2, Martin Vérot3, Tangui Le Bahers3, Marie-Laure Bocquet3, Nicolas Lorente2, and Laurent Limot1 — 1IPCMS, Université de Strasbourg, UMR CNRS 7504, 67034 Strasbourg, France — 2ICN2, Campus UAB, 08193 Bellaterra, Spain — 3ENS Lyon, Université Claude Bernard, CNRS, 69007 Lyon, France
Organometallic molecules offer promising perspectives for improving spintronic devices. Metallocenes wires, in particular ferrocene wires (FeCp2, Cp=C5H5), have been predicted to produce currents with a spin polarization close to 100%. The design and conception of such wires is however hampered by the little and often contradictory knowledge we have concerning the molecule-substrate and molecule-molecule interaction of ferrocene.
By means of low-temperature STM and DFT calculations, we show how associatively adsorbed ferrocene self-assembles on copper surfaces adopting a configuration that is independent of the surface orientation. The stability of the two-dimensional structure is ensured by a combination of vertical and horizontal-lying molecules relative to the surface. We also show that a subsequent exposure of the molecular layer to single magnetic cobalt atoms leads to the formation of upstanding Co-FeCp2 molecules that exhibit the Kondo effect. Through a tip-assisted manipulation, we show that the newly formed molecule consists of ferrocene adsorbed on top of cobalt.