Ferromagnetic resonance from nanoparticle agglomerates in nonmagnetic matrices

Nikolaos Gouskos 3Janusz Typek 2Urszula Narkiewicz 1,4Michał Maryniak 2K Aidinis 3

1. Technical University of Szczecin, Pulaskiego 10, Szczecin 70-322, Poland
2. Technical University of Szczecin, Institute of Physics (TUS), al. Piastów 48, Szczecin 70-311, Poland
3. Physics Department, University of Athens, Univ Athens, Dept Phys, Solid State Sect., Zografos 15784, Athens, Greece
4. Technical University of Szczecin, Institute of Chemical and Environment Engineering, Pulaskiego 10, Szczecin 70-322, Poland

Abstract

Samples of α-Fe and Fe3C nanoparticle agglomerates dispersed at different concentrations in various nonmagnetic matrices have been prepared. The agglomerates have been characterized by XRD and SEM spectroscopy. Magnetic resonance measurements of the samples have been carried out at different temperatures in the 4-300 K range. An intense and broad magnetic resonance absorption line has been recorded at different magnetice resonance fields for various matrices. With decreasing temperatures the resonance field has shifted and the intensity and the linewidth of that resonance line have displayed an unusual behavior. The resonance line could be fitted by a superposition of two Lorentzian-shape lines: one centered at lower magnetic field and the other placed at higher resonance magnetic field showing strongly decreased integrated intensity with decreasing temperatures. It is suggested that the magnetic resonance condition depends essentially on the internal magnetic field. This phenomenon is stronger for the Fe nanoparticle agglomerates than for Fe3C, for which the Neel temperature is higher. The magnetic exchange interaction between spins essentially influences the above processes.

 

Related papers
  1. Welcome address
  2. Carbon nanotubes applications for drug and gene delivery
  3. Europejska Platforma Technologiczna Nanomedycyny
  4. ZrO2:Tb nanopowders obtained by coprecipitation method
  5. ZnFe2O4/ZnO core-shell particles obtained by coprecipitation route
  6. Raman scattering from ZnO doped with Fe, Mn and Co nanoparticles
  7. Hydrothermal Synthesis of ZnAl2O4 Spinel
  8. Comparison of Au/ZrO2 materials prepared by precipitation and impregnation methods
  9. Low-frequency Raman scattering from transition-metal-doped ZnO nanoparticles
  10. Surface chemistry of Pr-doped nanocrystalline zirconia
  11. Effect of iron addition on the properties of ZnO obtained by precipitation
  12. Iron-carbon nanofillers for polymers
  13. Poisoning of iron catalyst with sulfur
  14. Structure and physical properties of TiC nano- and microparticle filled polyester and polyurethane
  15. FMR study of carbon coated cobalt nanoparticles dispersed in paraffin
  16. Temperature dependence of the FMR spectra of polymer composites with nanocrystalline α-Fe/C filler
  17. Catalytic decomposition of ethylene on nanocrystalline cobalt
  18. Electrical conductivity of TiC and (Ti,W)C ceramic samples
  19. Magnetic resonance study of PTMO - block - PET copolymer filled with a mixture of Fe3O4 and Fe3C nanoparticles at low concentration
  20. Surface diffusion of potassium from iron catalyst
  21. Studies of the initial stage of the carburisation of nanocrystalline iron with methane
  22. KINETICS OF CARBON DEPOSIT FORMATION FROM DECOMPOSITION OF METHANE ON NANOCRYSTALLNE IRON SURFACE
  23. Temperature dependence of microwave resonance absorption studies of α-iron and iron carbide nanoparticle agglomerates in a diamagnetic matrix
  24. Nanocrystallline iron-carbon fillers for polymers
  25. Preparation of the Nanocrystalline Iron Carbide in Reaction of Iron with Methane or Methane/Hydrogen Mixture

Presentation: oral at E-MRS Fall Meeting 2004, Symposium I, by Nikolaos Gouskos
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-29 09:46
Revised:   2009-06-08 12:55