Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.5: Vortrag
Montag, 31. März 2014, 11:30–11:45, TRE Phy
Fe on metalloporphyrin arrays: Site-selective adsorption, atomic switching and modification of magnetic moments — Saranyan Vijayaraghavan1, •Willi Auwärter1, David Ecija1, Knud Seufert1, Uta Schlickum2,3, Markus Etzkorn2,3, Stefano Rusponi3, Pardeep K. Thakur4, Sebastian Stepanov2, Torsten Houwaart5, Philippe Sautet5, Marie-Laure Bocquet5, Harald Brune3, and Johannes V. Barth1 — 1Technische Universität München, Department of Physics, E20, Garching, Germany — 2Max Planck Insitut für Festkörperforschung, Stuttgart, Germany — 3Ecole Polytechnique Fédérale de Lausanne, Institut de Physique de la Matière Condensée, Lausanne, Switzerland — 4European Synchrotron Radiation Facility, Grenoble, France — 5Ecole Normale Supérieure de Lyon, Laboratoire de Chimie, Lyon, France
The confinement and ordering of nanoscale objects as individual atoms or molecules on substrates has gained widespread attention in recent years leading to the realization of individually addressable quantum arrays. Here, we use highly regular metalloporphyrin (Co-TPP) arrays on a Ag(111) support as template for the site-specific adsorption of Fe. Our multi-technique approach combining scanning tunneling microscopy, X-ray magnetic circular dichroism and complementary density functional theory calculations reveals an interaction between the Fe and the Co center of the porphyrin, reviving the magnetic moment of the latter, which was quenched upon adsorption. Furthermore, individual Fe atoms can be switched between four equivalent positions on the porphyrin macrocycle, reflecting the molecular saddle-shape.