Microstructures and Magnetic Alignment of L10 FePt Nanoparticles

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dc.contributor.author Kang, Shishou
dc.contributor.author Shi, Shifan
dc.contributor.author Jia, Zhiyong
dc.contributor.author Thompson, G. B.
dc.contributor.author Nikles, David. E.
dc.contributor.author Harrell, J. W.
dc.date.accessioned 2018-11-12T22:43:58Z
dc.date.available 2018-11-12T22:43:58Z
dc.date.issued 2007-05-09 en_US
dc.identifier.citation Shishou, K., et al. (2007): Microstructures and Magnetic Alignment of L10 FePt Nanoparticles. Journal of Applied Physics, 101(9). en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/4903
dc.description.abstract 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 L10 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 L10 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 50/ 50, 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 L10 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. en_US
dc.format.mimetype application/pdf en_US
dc.subject Nanoparticles en_US
dc.subject Chemical compounds and components en_US
dc.subject Crystallography en_US
dc.subject Hydrology en_US
dc.subject Phase transitions en_US
dc.subject Magnetic properties en_US
dc.subject Electron diffraction en_US
dc.subject Transition metals en_US
dc.subject Energy dispersive X-ray spectroscopy en_US
dc.title Microstructures and Magnetic Alignment of L10 FePt Nanoparticles en_US
dc.type text en_US

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