Growth control of stoichiometry in LaMnO3 epitaxial thin films by pulsed laser deposition |
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Authors: | Zsolt Marton Sung Seok A Seo Takeshi Egami Ho Nyung Lee |
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Institution: | 1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;2. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA;3. Department of Physics and Astronomy and Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA |
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Abstract: | We have studied structural, magnetic, and optical transport properties of LaMnO3 (LMO) thin films grown on SrTiO3. While the stoichiometric LMO is an insulating antiferromagnet, it tends to be a ferromagnetic insulator when grown as thin films. By exploring the majority of growth parameters, we have found that the bulk-like electronic and magnetic phases can be stabilized by growing thin films under reducing atmospheres and by using more energetic laser processes. These conditions are found to reduce the La deficiency in the film resulting in the greatly improved cation stoichiometry. Since oxides are prone to reduce the oxygen content and to alter the cation ratio under such growth conditions, it suggests that the cation and oxygen stoichiometries in complex oxide thin films can be improved by properly optimizing the growth parameters. |
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Keywords: | A3 Laser epitaxy B1 Oxides B1 Perovskites B2 Magnetic materials |
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