Co doped ZnO semiconductor materials: structural, morphological and magnetic properties
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- Popa, A., Toloman, D., Raita, O. et al. centr.eur.j.phys. (2011) 9: 1446. doi:10.2478/s11534-011-0063-y
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.