Bulk FePt-based nanocomposite magnets with enhanced exchange coupling

Chuan Bing Rong*, Vikas Nandwana, Narayan Poudyal, J. Ping Liu, Mikhail E. Kozlov, Ray H. Baughman, Yong Ding, Zhong Lin Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


High density bulk FePt/ Fe3 Pt nanocomposite magnets have been prepared by high-pressure warm compaction of chemically synthesized FePt and Fe3 O4 nanoparticles. It is found that the density increases with the compaction pressure and temperature. Density of the bulk samples up to 95% theoretical value has been obtained while the nanostructured morphology is retained. It is also observed that a high pressure expedites the FePt phase transition from the disordered face-centered-cubic structure to the L 10 structure, leading to the phase transition temperature in the compacts one hundred degrees lower than usual. This phase transition in turn facilitates the consolidation of the compacts. Magnetic characterizations showed that interphase exchange coupling is enhanced upon the compaction. Post-annealing of the compacts results in further improved magnetic performance of the compacts owing to interface modification. Energy products up to 16.3 MG Oe of the isotropic bulk nanocomposite magnets have been achieved, which is significantly higher than the theoretical limit for fully dense single-phase FePt magnets.

Original languageEnglish (US)
Article number023908
JournalJournal of Applied Physics
Issue number2
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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