One-pot synthesis of urchin-like FePd-Fe3O4 and their conversion into exchange-coupled L10-FePd-Fe nanocomposite magnets

Yongsheng Yu, Kewei Sun, Yuan Tian, X. Z. Li, M. J. Kramer, D. J. Sellmyer, J. E. Shield, Shouheng Sun

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


We report a one-pot synthesis of urchin-like FePd-Fe3O 4 nanocomposites, spherical clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled thermal decomposition of Fe(CO)5 and reduction of Pd(acac)2. The FePd NPs with sizes between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3O4 NRs grow on the surface of these SPs. Reductive annealing at 500 C converts the FePd-Fe3O4 into exchange-coupled nanocomposites L10-FePd-Fe with their Hc tunable from 0.8 to 2.6 kOe and Ms controlled from 90 to 190 emu/g. The work provides a general approach to L10-FePd-Fe nanocomposite magnets for understanding exchange coupling at the nanoscale. The concept may be extended to other magnetic nanocomposite systems and may help to build superstrong magnets for magnetic applications.

Original languageEnglish (US)
Pages (from-to)4975-4979
Number of pages5
JournalNano Letters
Issue number10
StatePublished - Oct 9 2013


  • exchange coupling
  • nanocomposite magnets
  • nanocomposites
  • reductive annealing

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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