Structural, optical and magnetic properties of (ZnO)1−x(MnO2)x thin films deposited at room temperature |
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Authors: | S. Karamat J.J. Lin P. Lee S.V. Springham R.S. Rawat |
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Affiliation: | a Natural Science and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616 b School of Material Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 |
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Abstract: | The structural, magnetic and optical properties of (ZnO)1−x(MnO2)x (with x = 0.03 and 0.05) thin films deposited by pulsed laser deposition (PLD) were studied. The pellets used as target, sintered at different temperatures ranging from 500 °C to 900 °C, were prepared by conventional solid state method using ZnO and MnO2 powders. The observation of non-monotonic shift in peak position of most preferred (1 0 1) ZnO diffraction plane in XRD spectra of pellets confirmed the substitution of Mn ions in ZnO lattice of the sintered targets. The as-deposited thin film samples are found to be polycrystalline with the preferred orientation mostly along (1 1 0) diffraction plane. The UV-vis spectroscopy of the thin films revealed that the energy band gap exhibit blue shift with increasing Mn content which could be attributed to Burstein-Moss shift caused by Mn doping of the ZnO. The deposited thin films exhibit room temperature ferromagnetism having effective magnetic moment per Mn atom in the range of 0.9-1.4μB for both compositions. |
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Keywords: | Diluted magnetic semiconductor Thin films Pulsed laser deposition |
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