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

Adriana Popa 1 , Dana Toloman 1 , Oana Raita 1 , Alexandru Biris 1 , Gheorghe Borodi 1 , Thikra Mustafa 2 , Fumiya Watanabe 2 , Alexandru Biris 2 , Alexandru Darabont 1 , and Liviu Giurgiu 1
  • 1 National Institute for Research and Development of Isotopic and Molecular Technologies, 400293, Cluj-Napoca, P. O. Box 700, Romania
  • 2 UALR Nanotechnology Center, Applied Science Department, University of Arkansas at Little Rock, Arkansas, 72204, USA

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.

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