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 40.7: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Inelastic electron tunneling spectroscopy on single molecule magnets in MgO based magnetic tunnel junctions — •Jana Münchenberger, Zoe Kugler, Andy Thomas, and Günter Reiss — Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld
We investigated single molecule magnets (SMMs) on MgO based magnetic tunnel junctions (MTJs). The junctions are prepared by dc- and rf-magnetron sputtering in a vacuum system with a base pressure of 10−7mbar. The MTJs with MgO barrier are doped with SMMs to investigate their vibrational modes on the barrier’s surface by IET-Spectroscopy.
We tested the MTJs with regard to the influence of several preparation parameters such as annealing temperature, solvent and solvent concentration on the barrier and the TMR ratio. We succeeded to produce MgO based MTJs doped with SMMs with a TMR ratio of about 34% at room temperature and 52% at 13 K (annealed at 1700 C).
The vibrational modes are obtained by IETS-measurements at low temperature. The results are compared with IR-spectra of the molecules. First measurements showed a good agreement between the IET-spectra and the IR-spectra of the molecules.