Two- and three-dimensional calculation of remanence enhancement of rare-earth based composite magnets (invited)

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  • T. Schrefl
    Institut für Angewandte und Technische Physik, T. U. Wien, Wiedner Hauptstrasse 8, A-1040 Vienna, Austria
  • R. Fischer
    Max-Planck-Institut für Metallforschung, Institut für Physik, Postfach 80 06 65, 70506 Stuttgart, Germany
  • J. Fidler
    Institut für Angewandte und Technische Physik, T. U. Wien, Wiedner Hauptstrasse 8, A-1040 Vienna, Austria
  • H. Kronmüller
    Max-Planck-Institut für Metallforschung, Institut für Physik, Postfach 80 06 65, 70506 Stuttgart, Germany

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<jats:p>Micromagnetic calculations using a finite element technique rigorously describe the magnetic properties of novel, isotropic rare-earth-based composite magnets. Numerical results obtained for a composite material of Nd2Fe14B, SmCo5 or Sm2(Fe0.8Co0.2)17N2.8 and α-Fe particles show that remanence, coercivity, and coercive squareness sensitively depend on microstructural features. Interparticle exchange interactions enhance the remanence by about 60% with respect to noninteracting particles for a mean-grain size approaching the exchange length of the soft magnetic phase and a significant percentage of α-Fe. On the other hand, exchange interactions between the phases suppress the nucleation of reversed domains and thus preserve a high coercive field. Therefore, optimally structured, isotropic composite magnets show remarkably high energy products exceeding 400 kJ/m3.</jats:p>

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