Research Article

Central European Journal of Physics

, Volume 9, Issue 6, pp 1446-1451

Co doped ZnO semiconductor materials: structural, morphological and magnetic properties

  • Adriana PopaAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies Email author 
  • , Dana TolomanAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Oana RaitaAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Alexandru Radu BirisAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Gheorghe BorodiAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
  • , Thikra MustafaAffiliated withUALR Nanotechnology Center, Applied Science Department, University of Arkansas at Little Rock
  • , Fumiya WatanabeAffiliated withUALR Nanotechnology Center, Applied Science Department, University of Arkansas at Little Rock
  • , Alexandru Sorin BirisAffiliated withUALR Nanotechnology Center, Applied Science Department, University of Arkansas at Little Rock
  • , Alexandru DarabontAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies
    • , Liviu Mihail GiurgiuAffiliated withNational Institute for Research and Development of Isotopic and Molecular Technologies

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Abstract

Structural, morphological and magnetic properties of Zn1−xCoxO (x = 0.01 and 0.03) powdered materials are presented. XRD studies reveal a wurtzite-type structure, while the formation of a Co3O4 secondary phase was evidenced by Raman spectroscopy. A ferromagnetic behaviour with low Curie temperature was evidenced by Electron Paramagnetic Resonance (EPR) investigation. We suggest that the origin of the ferromagnetism in Zn1−xCoxO powders is probably due to the presence of the mixed cation valence of Co ions via a double-exchange mechanism rather than the real doping effect.

Keywords

diluted magnetic semiconductors ZnO powders ferromagnetism