Rapid thermal annealing of FePt nanoparticles

Kazuaki Yano, Vikas Nandwana, Narayan Poudyal, Chuan Bing Rong, J. Ping Liu

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34 Scopus citations

Abstract

We report a systematic study on rapid thermal annealing (RTA) of FePt nanoparticles. FePt particles with an average size of 8 nm were synthesized by a chemical solution method, and then annealed using RTA and conventional furnace annealing (FA). It was observed that FePt nanoparticles can be transformed from disordered A1 phase to ordered L 10 phase at 650 °C for 10 s using RTA, which is much shorter than the time needed for FA. The transmission electron microscopy and x-ray diffraction studies have revealed that the particle agglomeration and grain growth in the RTA treated samples are much less than in the FA treated samples. A linear correlation between the coercivity and the square root of the treatment time √t was observed in the RTA treated samples, which implies that the phase transition is related to atomic diffusion of Fe atoms from Fe-rich shells into the Pt-rich cores.

Original languageEnglish (US)
Article number013918
JournalJournal of Applied Physics
Volume104
Issue number1
DOIs
StatePublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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