Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.53: Poster

Wednesday, March 24, 2010, 15:00–17:30, Poster A

Anomalous hysteresis loops measured by magneto-optical Kerr effect in Ni/rubrene bilayers — •Wen Li¹, Michael Fronk¹, Felix Springer², Hartmut Kupfer¹, Steffen Schulze¹, Michael Hietschold¹, Manfred Albrecht¹, Dietrich R. T. Zahn¹, and Georgeta Salvan¹ — ¹Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Metal/organic heterostructures formed by the deposition of metals on organic films find a wide application range in organic electronics and spintronics. In this work Ni(14 nm)/rubrene(15 nm) bilayers were fabricated by subsequent deposition in ultra-high vacuum. For the very low evaporation rate used for the rubrene deposition, the bilayer morphology is characterized by large, well separated islands. The magnetic and structural properties of the heterostructure were probed by SQUID, AFM and TEM measurements, respectively. The magneto-optical Kerr effect (MOKE) of this ferromagnetic/organic bilayer was measured in the energy range from 1.5 eV to 5.5 eV. At photon energies near the zero crossing point in the real part of the MOKE spectrum, anomalous hysteresis shapes were obtained. The numerical analysis of the MOKE hysteresis at several photon energies reveals the combination of two components with orthogonal magnetization or different anisotropy.