Magnetic and structural properties basic solid state physics of transition metal doped zinc-oxide nanostructures

resumo

We report on the magnetic and structural properties of two types of nanostructures doped with Co or Mn, namely, ZnO nanowires and colloidal ZnO nanocrystals. Electron para magnetic resonance (EPR) spectra have been measured and analysed to extract information on the incorporation of the ions in the lattice. A detailed analysis by means of simulations of the experimental EPR spectra confirms that the transition metal. (TM) ions were mainly incorporated occupying the Zn(2+) sites in the wurtzite structure of ZnO. Furthermore, for both types of nanostructures the EPR spectra are composed of more than one signal, revealing locally distorted environments or core-shell structures, proved by surface modifications via inorganic coatings. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

palavras-chave

NATURLICHEN ZNO-KRISTALLEN; RESONANZ VON MN; THIN-FILMS; FERROMAGNETISM; SEMICONDUCTORS; IONEN; EPR

categoria

Physics

autores

Ankiewicz, AO; Gehlhoff, W; Martins, JS; Pereira, AS; Pereira, S; Hoffmann, A; Kaidashev, EM; Rahm, A; Lorenz, M; Grundmann, M; Carmo, MC; Trindade, T; Sobolev, NA

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