Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles

Chuan Bing Rong*, Narayan Poudyal, Girija S. Chaubey, Vikas Nandwana, R. Skomski, Y. Q. Wu, M. J. Kramer, J. Ping Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

FePt nanoparticles with a size of 3 nm and thermally stable room-temperature ferromagnetism are investigated. The monodisperse nanoparticles were prepared by chemical synthesis and a salt-matrix annealing technique. Structural and magnetic characterizations confirmed the phase transition from the disordered face-centered cubic structure to the L 10 structure with the chemical ordering parameter of 0.62±0.05. Analysis in blocking temperature and fitting of temperature dependence of switching field reveals that the transformed 3 nm nanoparticles have a magnetic anisotropy constant of (2.8±0.2) × 106 J m3, smaller than those for the bigger particles and the fully ordered L 10 bulk phase.

Original languageEnglish (US)
Article number043913
JournalJournal of Applied Physics
Volume102
Issue number4
DOIs
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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