Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Metal substrates: Adsorption of organic / bio molecules VII

O 52.7: Vortrag

Donnerstag, 26. März 2009, 16:30–16:45, SCH A118

Electronic and magnetic coupling of iron and copper phthalocyanine to ferromagnetic Co(100) surfaces — •Felix Schmidt¹, Jens Sauther¹, Ehesan Ali², Stefan Lach¹, Peter Oppeneer², and Christiane Ziegler¹ — ¹Department of Physics, University of Kaiserslautern, Erwin Schrödinger Str. 56, D-67663 Kaiserslautern, Germany — ²Department of Physics and Materials Science, Box 530, Uppsala University, S-75121 Uppsala, Sweden

Metallo-phthalocyanines are organic semiconductors which show in certain cases promising magnetic properties, advertising them for use in organic spintronics. Here, copper (CuPc) and iron phthalocyanine (FePc) were grown on ultra thin layers of Co(100) substrates with well known highly spin-polarized electron injection capability. Photoelectron spectroscopy (XPS) reveals different interactions between the pyrolic nitrogen atoms and the cobalt surface for the two phthalocyanines. The analysis of the different multiplet structures appearing for the nitrogen core levels in the submonolayer regime and UPS investigations of the valence band electronic structure of the Co dominated region near the Fermi level indicates a particularly electronic coupling and a rehybridisation of the molecular orbitals with the cobalt orbitals. In order to clarify the influence of the two different central atoms on the electronic- and subsequently the magnetic coupling to the Co substrate, theoretical calculations using the GGA and GGA+U methodologies on a structure of Fe/Cu-phthalocyanine adsorbed on a 3-layered cobalt surface were performed indicating a ferromagnetic coupling between FePc and Co.