Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.39: Poster

Freitag, 30. März 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.