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 language | English (US) |
---|---|
Article number | 013918 |
Journal | Journal of Applied Physics |
Volume | 104 |
Issue number | 1 |
DOIs | |
State | Published - 2008 |
Externally published | Yes |
Funding
This work was supported by ONR/MURI under Grant No. N00014-05-1-0497, DoD/DARPA through ARO under Grant No. DAAD 19-03-1-0038, and USHIO Inc. This work was also supported by Center of Nanostructured Materials and Characterization Center for Materials and Biology at the University of Texas at Arlington.
ASJC Scopus subject areas
- General Physics and Astronomy