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Room temperature ferromagnetism in Tb-doped ZnO dilute magnetic semiconducting nanoparticles

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Abstract

Pure and Tb-doped ZnO nanoparticles have been synthesized by chemical co-precipitation method. The transmission electron microscopy study reveals the spherical morphology of synthesized nanoparticles with average particle size 14–18 nm. The effect of Tb-doping on structural, optical and magnetic properties has been studied. X-ray diffraction shows that pure and Tb-ZnO nanoparticles exhibit wurtzite structure having hexagonal phase with primitive unit cell. It further reveals that there is no effect of Tb-doping on the X-ray diffraction pattern up to 2 % doping, however, higher doping concentration result in accumulation of Tb on ZnO surface. Photoluminescence spectra reveal that the doping Tb in ZnO changes crystallographic structure generating non-radiative oxygen vacancies. Three emission peaks located around 423, 485 and 515 nm has been observed. Pure ZnO nanoparticles show diamagnetic character, however, Tb-doped ZnO nanoparticles exhibit room temperature ferromagnetism. The correlation between defects generated upon Tb-doping to the observed ferromagnetism, in the synthesized nanoparticles, has been reported.

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Acknowledgments

One of the authors, Gurmeet Singh Lotey, gratefully acknowledges the Department of Science and Technology (DST), Government of India, for awarding him the INSPIRE (Innovation in Science Pursuit for Inspired Research) fellowship to carry out this research work.

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  1. Nano Research Lab, School of Physics and Materials Science, Thapar University, Patiala, 147 004, India

    Gurmeet Singh Lotey, Jaspal Singh & N. K. Verma

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  1. Gurmeet Singh Lotey
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  2. Jaspal Singh
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  3. N. K. Verma
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Correspondence to Gurmeet Singh Lotey.

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Lotey, G.S., Singh, J. & Verma, N.K. Room temperature ferromagnetism in Tb-doped ZnO dilute magnetic semiconducting nanoparticles. J Mater Sci: Mater Electron 24, 3611–3616 (2013). https://doi.org/10.1007/s10854-013-1292-1

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