Size-dependent chemical and magnetic ordering in L10-FePt nanoparticles

Chuan Bing Rong*, Daren Li, Vikas Nandwana, Narayan Poudyal, Yong Ding, Zhong Lin Wang, Hao Zeng, J. Ping Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

324 Scopus citations

Abstract

The size dependence of the chemical-ordering parameter and magnetic-ordering properties coercivity, magnetization and curie temperature of fct-FePt nanoparticles was investigated. Transmission electron microscopy (TEM) was used for the FePt nanoparticles with different sizes before and after annealing in a salt matrix. TEM observation revealed that when the particle size is smaller than or equal to 8 nm the fct nanoparticles are monocrystaline whereas the 15 nm fct nanoparticles are polycrystalline. The magnetic ordering temperatures of ferromagnets with reduced size in all three dimensions have been little studied and this was addressed by applying the salt-matrix-annealing technique. To understand strong size dependence of the Curie temperature the finite-size scaling theory was used to fit the behavior. It was observed that long range ordering parameter decreases with decreasing particle size.

Original languageEnglish (US)
Pages (from-to)2984-2988
Number of pages5
JournalAdvanced Materials
Volume18
Issue number22
DOIs
StatePublished - Nov 17 2006
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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