Structural,optical and magnetic characterizations of Mn-doped MgO nanoparticles |
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| Authors: | S. Azzaza M. El-Hilo S. Narayanan J. Judith Vijaya N. Mamouni A. Benyoussef A. El Kenz M. Bououdina |
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| Affiliation: | 1. Laboratoire de Magnétisme et Spectroscopie des Solides, Département de Physique, Université Badji Mokhtar, B.P. 12, Annaba 23000, Algeria;2. Department of Physics, College of Science, University of Bahrain, PO Box 32038, Bahrain;3. Catalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College, Chennai 600 034, India;4. Laboratoire de Magnétisme et de Physique des Hautes Energies Département de physique, URAC 12, B.P. 1014, Faculté des sciences, Mohammed V-Agdal University, Rabat, Morocco;5. Nanotechnology Centre, University of Bahrain, PO Box 32038, Bahrain |
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| Abstract: | Structural, optical and room temperature magnetic properties of Mn-doped MgO nanoparticles with Mn fractions (5–50 at.%), were investigated. The as-prepared pure MgO, with grain size of about 15 nm, exhibits two magnetization components, one is diamagnetic and another is superparamagnetic. After removing the diamagnetic contribution, the magnetization curve exhibits superparamagnetic behavior which may be attributed to vacancy defects. As the Mn content increases, the lattice parameter decreases, the ferromagnetism appears and the emission bands were considerably blue shifted. First principle electronic structure calculations reveal the decrease of both the gap and the Curie temperature with increasing Mn concentration. The obtained results suggest that both Mn doping and oxygen vacancies play an important role in the development of room temperature ferromagnetism. |
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| Keywords: | Nanostructures Chemical synthesis Ab initio calculations Magnetic properties Luminescence |
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