Bulk FePt Fe3 Pt nanocomposite magnets prepared by spark plasma sintering

Chuan Bing Rong*, Vikas Nandwana, Narayan Poudyal, J. Ping Liu, Tetsuji Saito, Yaqiao Wu, Matthew J. Kramer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

FePt Fe3 Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3 O4 nanoparticles under 100 MPa at 400-600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L 10 started at 500 °C and was almost completed at 600 °C during the sintering. The activated atomic diffusion during the phase transition led to a significant increase in density. The density about 70% of the theoretical value has been obtained. Grain size of the sintered samples remains nanoscale even after a postannealing at 700 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.

Original languageEnglish (US)
Article number09K515
JournalJournal of Applied Physics
Volume101
Issue number9
DOIs
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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