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

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Popa A., Toloman D., Raita O., Biris A., Borodi G., Mustafa T., Watanabe F., Biris A., Darabont A., Giurgiu L.
Open Physics
|
2011
|
vol. 9
|
issue 6
1446-1451
EN
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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