Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: [MA] Poster II
O 91.39: Poster
Friday, March 30, 2012, 11:00–14:00, Poster A
Organic molecular beam deposition of a paramagnetic organic magnet — Sabine-Antonia Savu1, •Reza Kakavandi1, Indro Biswas1, Mathias Glaser1, Lorenzo Sorace2, Matteo Mannini2, Andrea Caneschi2, Thomas Chassé1, and Maria Benedetta Casu1 — 1IPTC, University of Tübingen, Tübingen, Germany — 2LAMM, University of Florence, Florence, Italy
Nitronyl nitroxide radicals are an interesting class of organic compounds because of their magnetic properties. In this work we present a soft X-ray investigation of thin films of a pyrene derivative of the nitronyl nitroxide radical (nitpyrene), deposited onto well characterized single crystals surfaces, using strictly controlled evaporation conditions. We approach the deposition of nitpyrene using the knowledge obtained during the last years on thin film processes of organic molecules. The electronic structure and the interaction with the surface are discussed. By analyzing the attenuation of the XPS substrate signal, we find indications for island plus layer growth mode, supported by AFM measurements. We have also investigated the molecular orientation of the pyrene part versus film thickness, identifying the strength of molecule-molecule interactions versus molecule-substrate interactions by using X-ray absorption and photoemission spectroscopies.