Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 32: Spins in Organic Materials III (Focused Session, jointly with MA -- Organisers: Salvan, Hess, Timm)

DS 32.1: Vortrag

Mittwoch, 16. März 2011, 17:00–17:15, GER 37

Highly controlled deposition, environment, and surfaces in paramagnetic organic radicals — •Sabine-Antonia Savu, Indro Biswas, Mathias Glaser, Maria Benedetta Casu, and Thomas Chassé — IPTC, University of Tübingen, Tübingen, Germany

Organic radicals are a promising class of molecules which combine magnetic properties with the considerable advantages of organic molecules for example chemical and mechanical flexibility. For electronic applications, a comprehensive knowledge of the electronic, structural and morphological properties of organic magnets is indispensable. Nitpyrene is a pyrene-based nitronyl radical which belongs to a new class of organic magnets with high stability and promising magnetic properties. In this work we present a multi-technique investigation of nitpyrene thin films in order to get information on the electronic structure, growth modes, and thin film processes of this molecule. We show the results of investigations on nitpyrene thin films using X-ray based techniques, together with atomic force microscopy (AFM). Nitpyrene was deposited under ultra high vacuum conditions onto the well-characterized single crystal Au(111) surface using strictly controlled evaporation conditions. By analyzing the attenuation of the substrate core level signal, we find indications for a Stranski-Krastanov growth mode (layer plus islands). This information is also supported by AFM measurements. Furthermore, we find evidence for Ostwald ripening processes. ESR measurements confirmed the persistence of the radical nature in the thin films.