Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Magnetic Semiconductors II
MA 37.2: Vortrag
Mittwoch, 16. März 2011, 15:00–15:15, HSZ 401
Magneto-optical studies on doped and undoped ZnO nano-structures — •Stephanie Jankowski1, Limei Chen1, Sebastian Geburt2, Carsten Ronning2, and Wolfram Heimbrodt1 — 1Department of Physics and Material Science Center, Philipps-University Marburg, Renthof 5, D-35032 Marburg, Germany — 2Physikalisch-Astronomische Fakultät, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany
High quality ZnO nanowires doped with different content of Manganese and Cobalt as well as ZnO quantum wells embedded between ZnMgO barriers are investigated by magneto photoluminescence and magnetic circular dichroism (MCD) in a split-coil superconducting magnet system. The measurements have been performed in magnetic fields up to 7 Tesla in a temperature range 1.6-300 K. MCD and Zeeman-spectroscopy in the excitonic region have been used to determine the g-factors of the samples. Even in case of transition metal doped ZnO surprisingly small Zeeman-splitting has been found. The reason for the rather small values as well as the change of sign of the g-value will be discussed. The transition metal doped ZnO shows also an interesting difference concerning the optical 3d intra-ionic transitions. Whereas in the Co-doped samples the 3d transitions are observable in case of the Mn-doped samples the Mn-PL is rather vanishing. The physical reasons for the odd behaviour will be discussed.