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Title: Optical and magneto-optical properties of Co-doped CeO{sub 2−δ} films in the 0.5 to 4 eV range

Magnetically doped Ce{sub 1−x}Co{sub x}O{sub 2−δ} (nominal x = 0.05 and 0.10) films were systematically studied by spectroscopic ellipsometry and magneto-optical spectroscopy. The samples were prepared by pulsed laser deposition on MgO(100) substrates and grew as textured polycrystalline films with thickness between 200 and 750 nm. They exhibited room temperature ferromagnetism and an out-of-plane easy axis attributed to magnetoelastic effects from the in-plane compressive strain. The dispersion of dielectric function of Ce{sub 1−x}Co{sub x}O{sub 2−δ} films was parametrized by the sum of Tauc-Lorentz and damped Lorentz oscillators and adjusted numerically. Deduced optical band gaps were similar to those of pure CeO{sub 2}, but the Co doping increased the optical absorption. The magneto-optical spectroscopy was carried out in both Faraday and Kerr configurations in the photon energy range from 0.5 to 4 eV, showing a strong dependence of the magneto-optical effect on the Co content near the optical band edge.
Authors:
; ; ;  [1] ;  [2] ; ; ; ;  [3]
  1. Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague (Czech Republic)
  2. Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice (Czech Republic)
  3. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22273729
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; CERIUM OXIDES; DIELECTRIC MATERIALS; DOPED MATERIALS; ELLIPSOMETRY; ENERGY BEAM DEPOSITION; FERROMAGNETISM; LASER RADIATION; MAGNESIUM OXIDES; MAGNETO-OPTICAL EFFECTS; OPTICAL PROPERTIES; OSCILLATORS; PHOTONS; POLYCRYSTALS; PULSED IRRADIATION; SUBSTRATES; TEMPERATURE RANGE 0273-0400 K; THIN FILMS