Abstract
ZnO nanomaterials with different doping concentrations of Cr ions have been prepared by the hydrothermal method. The crystallographic parameters have been estimated by Rietveld analysis. The diffraction pattern indicates the preferential growth of the nanomaterials along ‘a’ axis. Photoluminescence (PL) and electron paramagnetic resonance (EPR) spectra reveal the presence of various defect states and singly ionized oxygen vacancy in all the Cr-doped ZnO nanomaterials. M-T curve suggests that all the magnetic phases (para, ferro, and anti-ferro) are present in the total magnetization of the Cr-doped ZnO nanomaterials. The calculation shows that 7% Cr-doped ZnO has the highest magnetic moment among others, though the ferromagnetic contribution (˜ 89.1%) in the total magnetization is more for 5% Cr-doped ZnO sample. The widely accepted bound magnetic polaron theory has been proposed here to explain the modulation of the magnetic behavior of doped ZnO nanomaterials due to the variation of the doping concentration of Cr ions.
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