Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Spinelectronics/ Spininjection in Heterostructures
MA 23.3: Vortrag
Mittwoch, 27. Februar 2008, 17:15–17:30, H 1028
Study of spin-injection in the organic semiconductor CuPc by means of spin-resolved two-photon photoemission — •Mirko Cinchetti1, Kathrin Heimer1, Oleksiy Andreyev2, Michael Bauer2, Huanjun Ding3, Yongli Gao3, Stefan Lach1, Christiane Ziegler1, and Martin Aeschlimann1 — 1Dpartment of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institut fuer Experimentelle und Angewandte Physik, Universitaet Kiel, 24098 Kiel, Germany — 3Deparment of Physics and Astronomy, University of Rochester, Rochester, NY 14267, USA
Spin injection from a ferromagnetic electrode into thin films of organic semiconductors (OSC) is a fundamental prerequisite for the implementation of OSC-based spintronics devices. All experimental studies done so far to demonstrate the feasibility of spin injection into OSC are based on magnetoresistance or electroluminescence measurements, which result in a spin-dependent signal integrated over the whole spintronics device. Great care has to be taken in the search of spin injection in such experiments, since stray fields may mimic the spin effects. We propose spin-resolved two-photon photoemission as an alternative method allowing to collect direct experimental information about the efficiency of spin injection. As a model system for OSC-based spintronics devices, we have studied the heterojunction between a Cobalt thin film and Copper phthalocyanine (CuPc). We will discuss the crucial role played by the specific interface properties (such as the surface topography of the ferromagnetic electrode and the related growth of the OSC) on the efficiency of spin injection.