Intra-cluster exchange-coupled high-performance permanent magnets

X. Rui, J. E. Shield, Z. Sun, R. Skomski, Y. Xu, D. J. Sellmyer, M. J. Kramer, Y. Q. Wu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Inert gas condensation has been used to produce Fe-rich Fe-Pt clusters imbedded in C or SiO2. Compositions of the clusters ranged from the single-phase Fe3Pt phase field to the single-phase FePt phase field, and included compositions in the two-phase Fe3Pt + FePt phase field. The as-formed clusters formed in the A1 fcc structure for all compositions, and after proper heat treatment transformed to the Fe3Pt and/or FePt phases, depending on composition. Because the clusters were well isolated, the scale of the phases was limited by the cluster size. This intracluster structuring on such a fine scale ensured that the soft Fe3Pt and hard FePt phases were fully magnetically exchange-coupled with each other, which allowed greater soft phase fractions comparing with previous work. Energy products of the two-phase clusters with 50% Fe3Pt exceeded 25 MGOe, compared to 11.8MGOe for the single-phase FePt clusters. Micromagnetic simulations revealed remarkable similarities with the experimental results with respect to the relationship between both coercivity and energy product as a function of cluster composition.

Original languageEnglish (US)
Pages (from-to)2576-2583
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Issue number21
StatePublished - Nov 2008


  • Cluster
  • Energy product
  • Exchange-spring
  • Inert gas condensation
  • Magnetic material

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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