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2011 | 120 | 6 | 1070-1073
Article title

FMR Study of Temperature Dependence of Magnetic Properties of Nanocrystalline 0.90(Fe_2O_3)/0.10ZnO

Content
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Languages of publication
EN
Abstracts
EN
The nanocrystalline mixed system 0.90(Fe_2O_3)/-0.10ZnO has been prepared by coprecipitation and calcination processes. The phase composition of samples was determined by X-ray diffraction. The studied nanocrystalline sample is dominated by phase Fe_2O_3 but very small amounts of ZnO and ZnFe_2O_4 phases were also identified. The ferromagnetic resonance investigations of the obtained sample have been carried out in the temperature range from liquid helium to room temperature. The asymmetrical and very intense magnetic resonance line was recorded at all temperatures. A significant shift of spectra towards lower magnetic fields with decreasing temperature was observed. A very good fitting by two Lorentzian functions has been obtained which suggested the existence of a strong anisotropic magnetic interaction. Some similarities in behaviour of ferromagnetic resonance parameters of the present sample and the 0.95Fe_2O_3Fe2O3/0.05ZnO sample were noticed but the parameters values were essentially different. The gradients Δ H_{r}/Δ T (where H_{r} is the resonance field), the broadening processes of the resonance lines as well as the line amplitudes were changing more intensely changing with temperature in comparison to sample 0.95Fe_2O_3Fe2O3/0.05ZnO. The following values Δ H_{r}/Δ T are obtained: 16.7(1) Gs/K and 20.7(1) Gs/K over the 60 K temperatures where below 40 K is 41.5(1) Gs/K and 56.0(1) Gs/K. The reorientation processes were more active at low temperatures for smaller concentrations of magnetic nanoparticles.
Keywords
EN
Contributors
author
  • Solid State Section, Department of Physics, University of Athens, Panepistimiopolis, Athens, 15 784, Greece
  • Institute of Physics, West Pomeranian University of Technology, Al. Piastów 17, 70-310 Szczecin, Poland
author
  • Solid State Section, Department of Physics, University of Athens, Panepistimiopolis, Athens, 15 784, Greece
  • Institute of Physics, West Pomeranian University of Technology, Al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Physics, West Pomeranian University of Technology, Al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology, al. Piastów 17, 70-310 Szczecin, Poland
author
  • Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology, al. Piastów 17, 70-310 Szczecin, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv120n616kz
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