Microstructures and magnetic alignment of L 10 FePt nanoparticles

Shishou Kang*, Shifan Shi, Zhiyong Jia, G. B. Thompson, David E. Nikles, J. W. Harrell, Daren Li, Narayan Poudyal, Vikas Nandwana, J. Ping Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Chemically ordered FePt nanoparticles were obtained by high temperature annealing a mixture of FePt particles with NaCl. After the NaCl was removed with de-ionized water, the transformed FePt nanoparticles were redispersed in cyclohexanone. X-ray diffraction patterns clearly show the L 10 phase. Scherrer analysis indicates that the average particle size is about 8 nm, which is close to the transmission electron microscopy (TEM) statistical results. The coercivity ranges from 16 kOe to more than 34 kOe from room temperature down to 10 K. High resolution TEM images reveal that most of the FePt particles were fully transformed into the L 10 phase, except for a small fraction of particles which were partially chemically ordered. Nano-energy dispersive spectroscopy measurements on the individual particles show that the composition of the fully transformed particles is close to 5050, while the composition of the partially transformed particles is far from equiatomic. TEM images and electron diffraction patterns indicate c -axis alignment for a monolayer of L 10 FePt particles formed by drying a dilute dispersion on copper grids under a magnetic field. For thick samples dried under a magnetic field, the degree of easy axis alignment is not as high as predicted due to strong interactions between particles.

Original languageEnglish (US)
Article number09J113
JournalJournal of Applied Physics
Issue number9
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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