Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 46: Poster 2
HL 46.53: Poster
Donnerstag, 29. März 2007, 15:00–17:30, Poster A
The local environment of isolated ZnSe:Mn nanparticles — •Andreas Hofmann1,2, Christina Graf1,2, Christine Boeglin3, Vladimir Korsounski4, Reinhard Neder4, and Eckart Rühl1,2 — 1Freie Universität Berlin, Institut für Chemie und Biochemie, D-14195 Berlin — 2Universität Würzburg, Institut für Physikalische Chemie, D-97074 Würzburg — 3Institute de Physique et Chimie des Materiaux de Strasbourg, F-67034 Strasbourg — 4Universität Würzburg, Institut für Mineralogie, D-97074 Würzburg
The synthesis and characterization of diluted magnetic semiconductor nanoparticles made substantial progress in the last years and it is expected that the combination of the electronic characteristics of semiconductor nanoparticles with the magnetic properties of ferromagnets leads to novel spintronic materials.
ZnSe nanoparticles doped with 0.1-0.3% Mn with respect to Zn were prepared using a high temperature organic approach. Photoluminescence- and electron paramagnetic resonance measurements give strong evidence for an incorporation of Mn inside the ZnSe crystal lattice. The crystal structure of the particles was studied by high resolution transmission electron microscopy and X-ray diffraction. For a more profound study of the local environment of the Mn ions, ZnSe:Mn quantum dots were investigated in X-Ray magnetic circular dichroism experiments. A comparison of the present results with experimental and theoretical data for single Mn shows that the quantum dots contain well separated Mn ions. Neither Mn-Mn coupling nor oxidation to higher Mn-oxidation states were observed.