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MA: Fachverband Magnetismus
MA 29: Magnetic Semiconductors I
MA 29.2: Talk
Thursday, March 25, 2010, 15:30–15:45, H22
Magnetic Effects of Defect Pairs in Zinc Oxide — •Waheed Adeagbo1, Guntram Fischer1, Arthur Ernst2, and Wolfram Hergert1 — 1Institute of Physics, MLU Halle-Wittenberg, Von-Seckendorff-Platz 1, 06120 Halle, Germany — 2Max Planck Institute for Microstructure Physics, Weinberg 2, 06120 Halle, Germany
In order to gain insight into intrinsic and extrinsic d0-magnetic properties of defectious ZnO we have carried out ab initio calculations on various types of defects formed by substitutionally doped atoms, Zn vacancies, and doped atom and vacancy defect pairs. The doped atoms include N and H which substitute either O or Zn lattice sites. The largest magnetic moment is induced when a Zn vacancy pair is created. Our results also show that some defects that are magnetic when isolated can become non-magnetic when being near other defects. We also investigate the magnetic interaction of different defect pairs. The results of total energy calculations show in all cases the stability of ferromagnetic configurations when compared to the antiferromagnetic counterparts. This characteristic is the strongest for the Zn-Zn vacancy.