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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.47: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

STM/NEXAFS INVESTIGATIONS OF METALLO-PHTHALOCYANINES GROWN ON FERROMAGNETIC Co(001) THIN FILMS — Kathrin Müller¹, Kathrin Heimer², Oleksiy Andreyev², Andreas Scheybal¹, Felix Schmitt², Jens Sauther², Rolf Bertschinger¹, Jan Peter Wüstenberg², Kim Timor¹, •Stefan Lach², Thomas Jung¹, Martin Aeschlimann², and Christiane Ziegler² — ¹Paul Scherrer Institut, Lab. for Micro&Nanostructures CH-5232 Villigen PSI — ²TU Kaiserslautern Department of Physics D-67663 Kaiserslautern

Due to their chemical tunability and weak spin-orbit coupling organic semiconducting materials are promising candidates for future spintronic devices.

This motivates detailed investigations of the interface between organic-semiconductors like metallo-phthalocyanines and ferromagnetic metallic substrates. Here, a STM/NEXAFS study of the morphology of submonolayer up to multilayer CuPc and FePc thin films on epitaxially grown ferromagnetic Co(001) films will be presented. Cobalt was chosen for its high degree of spin polarization at the Fermi level. The STM data reveal that for monolayer coverages the morphology on smooth Co films is different for the two chosen metallo- phthalocyanines. This difference in morphology will be compared to data relevant for spintronic devices such as the spin polarization at the surface.