Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.104: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Properties of ferromagnetic tunnel junctions with organic spacer layers — •Hartmut Vinzelberg, Joachim Schumann, Dieter Elefant, Jürgen Thomas, and Bernd Büchner — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
Within the spintronics/optoelectronics communities the search for alternative materials with improved properties for coherent spin transport recently has initiated strong activities in the field of organic spintronics and related materials. The realization of spin injection into organic semiconductors and the coherent spin transport over distances on the nanometer scale are discussed controversy in the literature. [1-3] Therefore, in this work ferromagnetic sandwich devices with Alq3-spacer are prepared and studied in order to find out which mechanism controls the observed spin-dependent transport effects: spin propagation in the organic film or tunneling over a barrier between the ferromagnetic electrodes. Spin-valve effects at low temperatures have been observed in a broad resistance interval from kΩ to MΩ-range without systematic area dependence. In some samples the magneto-resistance changes the sign as a function of the bias voltage. Additional SQUID and TEM studies suggest as transport mechanism tunneling processes between ferromagnetic electrodes separated by an organic barrier.
[1] J.S. Jiang, et al., Phys. Rev. B 77, 035303 (2008)
[2] H. Vinzelberg, et al., J. Appl. Phys., 103, 093720 (2008)
[3] V. Dediu, et al., Phys. Rev. B 78, 115203 (2008)