publication . Preprint . 2007

Ferromagnetism in Fe-doped ZnO Nanocrystals: Experimental and Theoretical investigations

Karmakar, Debjani; Mandal, S. K.; Kadam, R. M.; Paulose, P. L.; Rajarajan, A. K.; Nath, T. K.; Das, A. K.; Dasgupta, I.; Das, G. P.;
Open Access English
  • Published: 22 Feb 2007
Abstract
Fe-doped ZnO nanocrystals are successfully synthesized and structurally characterized by using x-ray diffraction and transmission electron microscopy. Magnetization measurements on the same system reveal a ferromagnetic to paramagnetic transition temperature > 450 K with a low-temperature transition from ferromagnetic to spin-glass state due to canting of the disordered surface spins in the nanoparticle system. Local magnetic probes like EPR and Mossbauer indicate the presence of Fe in both valence states Fe2+ and Fe3+. We argue that the presence of Fe3+ is due to the possible hole doping in the system by cation (Zn) vacancies. In a successive ab-initio electron...
Subjects
arXiv: Condensed Matter::Materials ScienceCondensed Matter::Strongly Correlated ElectronsPhysics::Atomic and Molecular Clusters
free text keywords: Condensed Matter - Materials Science
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