Abstract
The bulk polycrystalline samples with nominal compositions Zn0.98−y(Mn∕Co)0.02(Al∕Sb)yO (y=0, 0.01, and 0.03) have been synthesized via solid state reaction route. The x-ray diffraction results reveal the presence of mainly wurtzite structure of pure ZnO in all the Al∕Sb codoped ZnMnO and ZnCoO samples. EDAX results confirm the presence of all elements in the samples in the stoichiometric ratio. While the Zn(Mn∕Co)O samples show paramagnetic behavior at room temperature, the Al∕Sb codoped ZnMnO samples exhibit room temperature ferromagnetism (RTFM) with saturation magnetization (Ms). The M-H curves of Al∕Sb codoped ZnCoO samples show almost linear variation with a small kink at the origin, indicating the presence of weak ferromagnetism in the Al∕Sb codoped ZnCoO samples. Possible mechanisms of the observed RTFM in Al∕Sb codoped Zn(Mn∕Co)O samples are discussed in this paper.
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