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Title: Magneto-optical studies of SrGa{sub 0.7} Co{sub 0.3} O{sub 3−δ} perovskite thin films with embedded cobalt nanoparticles

Sr(Ga{sub 0.7} Co{sub 0.3})O{sub 3−δ}/Co perovskite/metal thin films have been systematically studied by means of Faraday and Kerr magneto-optical spectroscopies. The samples were prepared by pulsed laser deposition on (001) (LaAlO{sub 3}) {sub 0.3}(Sr{sub 2}AlTaO{sub 6}) {sub 0.7} (LSAT) and Si substrates, and grew as a perovskite matrix containing approximately 6% by volume of embedded metallic Co nanoparticles with diameter less than 20 nm, which were distributed throughout the film and at the film-substrate interface. The film thickness ranged from 130 to 310 nm. The perovskite matrix was single crystal on LSAT and polycrystalline on Si. The magneto-optical spectroscopy was carried out in both Faraday and Kerr configurations in the photon energy range from 0.5 to 5 eV in magnetic fields sufficient for sample saturation, showing a strong thickness dependence of the magneto-optical effect. This dependence was attributed to the different metallic Co content, nanoparticle size, and accumulation at the film-substrate interface.
Authors:
; ; ; ;  [1] ; ; ; ; ; ; ; ;  [2]
  1. Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague (Czech Republic)
  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22409933
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; ALUMINATES; APPROXIMATIONS; COBALT; COBALT OXIDES; ENERGY BEAM DEPOSITION; FARADAY EFFECT; GALLIUM OXIDES; INTERFACES; KERR EFFECT; LANTHANUM COMPOUNDS; LASER RADIATION; MAGNETIC FIELDS; MAGNETO-OPTICAL EFFECTS; NANOPARTICLES; POLYCRYSTALS; SILICON; STRONTIUM COMPOUNDS; SUBSTRATES; THIN FILMS