Cu doped ZnO pellets: study of structure and Cu specific magnetic properties

Cu doped ZnO polycrystalline pellets were synthesized with Cu concentrations varying from 2 to 10 wt% by a solid state reaction route (mixing of ZnO and CuO powders). Global magnetization measurements showed that all the samples were paramagnetic. Fitting the temperature-dependence of the magnetizat...

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Published inJournal of physics. Condensed matter Vol. 24; no. 50; p. 506001
Main Authors Vachhani, Prashant S, Dalba, Giusepe, Ramamoorthy, Raj Kumar, Rocca, Francesco, Šipr, Ondrej, Bhatnagar, Anil K
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 19.12.2012
Institute of Physics
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Summary:Cu doped ZnO polycrystalline pellets were synthesized with Cu concentrations varying from 2 to 10 wt% by a solid state reaction route (mixing of ZnO and CuO powders). Global magnetization measurements showed that all the samples were paramagnetic. Fitting the temperature-dependence of the magnetization to the Curie-Weiss law revealed the presence of an antiferromagnetic interaction between magnetic moments. Structural characterizations were carried out by x-ray diffraction and x-ray absorption spectroscopy (XAS) at the Cu K-edge. By analyzing the XAS data, we found that at low Cu content most of the Cu atoms substitute for Zn inside the ZnO wurtzite lattice, while for higher Cu concentrations some unreacted CuO remains segregated from the Zn1−xCuxO solid solution. Element-specific magnetic measurements were carried out by x-ray magnetic circular dichroism (XMCD) and compared to the results of ab initio calculations. The XMCD signal at the Cu K-edge originates from magnetic moments localized at Cu sites and, by monitoring the magnetic field dependence, we concur that these moments are associated with a paramagnetic state.
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ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/24/50/506001