Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.70: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Surface-Orientation-Dependent Spin Quenching of Adsorbed Co Porphyrin Molecules — •Lucas M. Arruda1, Matthias Bernien1, Fabian Nickel1, Lalminthang Kipgen1, Christian F. Hermanns1, Jorge Miguel1, Alex Krüger1, Dennis Krüger1, Nino Hatter1, Jens Kopprasch1, Qingyu Xu1,2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin — 2Department of Physics, Southeast University, 211189 Nanjing
Metalloporphyrin molecules on surfaces have been attracting the attention of the scientific community since their metal ion is fourfold coordinated within the molecular plane and displays two empty coordination sites that can be occupied by additional ligands or a surface. We have investigated submonolayers of Co octaethyl porphyrin molecules on Cu(001) and Cu(111) as well as on Au(001) and Au(111) surfaces by means of x-ray absorption spectroscopy and x-ray magnetic circular dichroism in an external magnetic field of 6 T at a temperature of 5 K. We find the Co magnetic moment quenched when the molecule is adsorbed on Cu(111), Au(001), and Au(111). On Cu(001), on the contrary, the Co ions display a significant magnetic moment. We attribute this modification of the molecular magnetic properties to the formation of a hybrid electronic state at the metal-organic interface. — Financial support by project VEKMAG (BMBF 05K13KEA) is gratefully acknowleged.