Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: [MA] Surface magnetism IV
O 81.4: Vortrag
Donnerstag, 17. März 2011, 16:00–16:15, HSZ 103
Magnetism of Cobalt-coordination nodes in 2D supramolecular networks — •Uta Schlickum1, Willi Auwärter2, Markus Etzkorn1, Stefano Rusponi1, Pardeep Thakur3, Knud Seufert2, Svetlana Klyatskaya4, Mario Ruben4, Johannes V. Barth2, and Harald Brune1 — 1Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, Switzerland — 2Physik Department E20, Technische Universität München, Germany — 3European Synchrotron Radiation Facility, Grenoble, France — 4Institut für Nanotechnologie, Karlsruher Institut für Technologie, Germany
Supramocular engineering on crystalline surfaces offers the possibility to fabricate networks with embedded metal centers having specific physicochemical properties. Here we report on the magnetic nature of individual Co atoms in 2D architectures providing different coordination environments probed with X-ray magnetic circular dichroism. Changing the coordination symmetry using related functional organic ligands strongly influences the magnetic characteristics of the metal center. While Co atoms with threefold coordination to carbonitriles show large magnetic moments, these vanish in the case of fourfold coordination to pyrrole ligands in a Co-porphyrin. Further modification of the magnetic properties by site-selective decoration of the individual Co centers by small Fe clusters will be discussed.