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Ferromagnetism in Mn Doped ZnO Nanoparticles: An EPR Study

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We report the synthesis of nominal 2 and 5 at.% Mn-doped ZnO nanocrystalline particles by a co-precipitation method followed by calcination at different temperatures. Transmission electron microscopy study and the Rietveld refinement of X-ray diffraction data revealed that these samples crystallize in the monophasic wurtzite structure. DC magnetization measurements of these samples, calcined at 675 K, showed that while nominal 2 at.% Mn-doped ZnO is ferromagnetic above room temperature, 5 at.% Mn-doped ZnO exhibited a paramagnetic behavior. A distinct ferromagnetic resonance (FMR) signal observed in the EPR spectra of 2 at.% Mn-doped ZnO further confirmed its room temperature ferromagnetism. EPR measurements were used to estimate the number of spins participating in ferromagnetic ordering of these compounds.
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Document Type: Short Communication

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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