Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: [MA] Joint Session "Surface Magnetism II" (jointly with O)

O 60.3: Vortrag

Donnerstag, 29. März 2012, 10:00–10:15, EB 301

Magnetic coupling in metal organic networks on surfaces — •Tobias R. Umbach, Christian Felix Hermanns, Matthias Bernien, Alex Krüger, Isabel Ferández-Torrente, Paul Stoll, Katharina J. Franke, Jose I. Pascual, and Wolfgang Kuch — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Metal organic networks offer the possibility to alter the electronic and magnetic functionality of surfaces on a nanometer scale. Here we report on the bilayer metal organic network of Fe atoms and 2,4,6-Tris(4-pyridyl)-1,3,5-triazine (T4PT) on a Au(111) surface. The network is investigated in terms of scanning tunneling microscopy (STM) and X-ray circular dichroism (XMCD). Fe atoms and T4PT molecules form a mixed ordered phase consisting of two distinct layers. The first layer has a triangular structure and every Fe atom is surrounded by three pyridyl groups of three different T4PT molecules. The second layer is exclusively built of T4PT molecules, centered with the triazine ring on top of the Fe atoms of the first layer. XMCD measurements reveal sizable magnetic moments of the Fe sites and an out of plane magnetic anisotropy. The field dependence of the XMCD signal reveals a finite ferromagnetic coupling of the Fe atoms in the Fe-T4PT network.