Influence of rare earth addition in cobalt ferrite thin films obtained by pulsed laser deposition |
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| Affiliation: | 1. Integrated Centre for Environmental Science Studies in the North-East Development Region - CERNESIM, “Alexandru Ioan Cuza” University of Iasi, 700506, Iasi, Romania;2. Faculty of Physics, "Alexandru Ioan Cuza" University of Iasi, 700506, Iasi, Romania;3. National Institute for Laser, Plasma and Radiation Physics, NILPRP, RO-077125, Magurele-Bucharest, Romania;4. Petru Poni Institute of Macromolecular Chemistry, RO-700487, Iasi, Romania;5. Université de Lille, CNRS, UMR 8523, PhLAM - Physique des Lasers, Atomes et Molécules, CERLA - Centre d’Etudes et de Recherches Lasers et Applications, Lille F, 59000, France;1. Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Aichi 466-8555, Japan;2. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan;3. Department of Physics, Technical University of Munich, Garching 85749, Germany;4. Department of Pure and Applied Physics, Kansai University, Suita, Osaka 564-8680, Japan;5. Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan;1. Arts, Commerce and Science College, Sonai, Nevasa, Ahmednagar, 414602, India;2. Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, 431004, Maharashtra, India;3. Department of Physics, Yeshwantrao Chavan Mahavidyalaya, Sillod, Aurangabad, India;1. Department of Physics, Indraraj Arts, Commerce and Science College, Sillod, Aurangabad, India;2. Department of Physics, Deogiri College, Aurangabad, 431001, Maharashtra, India;3. Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, 431004, Maharashtra, India;1. State Key Laboratory of Chemical Resource Engineering and School of Science, Beijing University of Chemical Technology, Beijing 100029, China;2. Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing 100029, China;1. Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland;1. Department of Materials Engineering, Institute of Mechanical Engineering, University of Tabriz, Tabriz 51666-16471, Iran;2. Electroceramics Group, Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran;3. Center for Pharmaceutical Nanotechnology and Biomaterials, Pharmaceutical Sciences Research Center, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran;4. Department of Pharmaceutics, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran;5. Materials Science and Engineering Department, Islamic Azad University Ahvaz Branch, Ahvaz, Iran |
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| Abstract: | The influence of rare earth (RE = Dy, Gd, Yb) ion doping on the structural, magnetic and optical properties of cobalt ferrite thin films was studied. CoFe2-xRExO4 (x = 0.01; 0.03; 0.05; 0.1; 0.2; 0.3) films were obtained by pulsed laser deposition on silicon substrates. The X-ray diffraction and Raman spectroscopy results on the bulk materials, which were used as targets during deposition, revealed the formation of residual phases as the concentration of RE dopant was increased. However, the annealed thin films presented diffraction lines and vibrational modes corresponding only to cobalt ferrite. A lower crystallinity of the deposited samples was observed when higher RE concentrations were used. Due to the substitution of Fe by RE elements which possess large ionic radii, the lattice parameter of the thin films presented a monotonous increase. The magnetic response of the nanostructures was correlated to the magnetic moment of the RE dopant and to the structural properties of the films. The optical bandgaps derived from the reflectance spectra presented an increasing trend as the Yb and Dy concentrations were augmented. |
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| Keywords: | Cobalt ferrite Rare earth Thin films Structural properties Magnetic hysteresis Optical bandgap |
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