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Magnetism of nanocrystalline Finemet alloy: experiment and simulation

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Listed:
  • O. Crisan
  • J. Grenèche
  • J. Le Breton
  • A. Crisan
  • Y. Labaye
  • L. Berger
  • G. Filoti

Abstract

Mössbauer spectrometry and magnetic measurements are employed to experimentally investigate the magnetic behavior of nanocrystalline Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 ribbons obtained by appropriate annealing of the amorphous precursor. A detailed analysis of the correlation between the microstructure of annealed samples and their magnetic properties is provided. Thermomagnetic data allow the Curie temperatures of both amorphous residual matrix and nanocrystalline phase to be estimated. The differences between Curie temperatures of amorphous residual matrix and amorphous precursor are investigated and explained in terms of magnetic polarization of the matrix by exchange fields arising from the nanocrystalline grains. Theoretical systems of spins consisting of a single ferromagnetic nanocrystalline grain immersed in weakly ferromagnetic environment, quite similar to our real samples, are considered and their magnetic behavior is investigated by Monte Carlo simulation of low temperature spin ordering, with emphasize on the matrix-nanocrystalline grain interface which is shown to exhibit peculiar magnetic behavior. The magnetic features of the matrix-nanocrystalline grain interface are studied, as depending on matrix-nanocrystalline grain exchange coupling as well as crystalline fraction of the nanocrystalline systems. Copyright Springer-Verlag Berlin/Heidelberg 2003

Suggested Citation

  • O. Crisan & J. Grenèche & J. Le Breton & A. Crisan & Y. Labaye & L. Berger & G. Filoti, 2003. "Magnetism of nanocrystalline Finemet alloy: experiment and simulation," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 34(2), pages 155-162, July.
    • Handle: RePEc:spr:eurphb:v:34:y:2003:i:2:p:155-162
    DOI: 10.1140/epjb/e2003-00207-3
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