Phase transformation and magnetic hardening in isolated FePt nanoparticles

Chuan Bing Rong*, Vikas Nandwana, Narayan Poudyal, Girija S. Chaubey, J. Ping Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Isolated monodisperse L10 FePt nanoparticles coated by carbon were obtained by adding enough surfactants that decomposed into carbon after the chemical synthesis and postannealing of the A1 FePt nanoparticles. The effect of isolation between FePt nanoparticles on the phase transition temperature and magnetic properties has been studied systematically by thermal, magnetic, and structural characterizations and analyses. It was found that the A1 to L1 0 phase transition temperature is dependent sensitively on the amount of isolation medium. The transition temperature shift reaches 150-200°C from nonisolated particle assemblies to completely isolated particles, which may be attributed to the high activation energy of the phase transformation for the isolated particles.

Original languageEnglish (US)
Article number4808146
Pages (from-to)437-443
Number of pages7
JournalIEEE Transactions on Nanotechnology
Volume8
Issue number4
DOIs
StatePublished - Jul 2009
Externally publishedYes

Keywords

  • Isolated L1 FePt nanoparticles
  • Magnetic hardening
  • Magnetocrystalline anisotropy
  • Phase transformation

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering

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