Sintering Behavior of Spin-Coated FePt and FePtAu Nanoparticles

Show simple item record Kang, Shishou Jia, Zhiyong Zoto, I. Reed, D. Nikles, David E. Harrell, J. W. 2018-11-13T14:40:48Z 2018-11-13T14:40:48Z 2006-04-19
dc.identifier.citation Kang, S., et al. (2006): Sintering Behavior of Spin-Coated FePt and FePtAu Nanoparticles. Journal of Applied Physics, 99(8). DOI: en_US
dc.description.abstract ePt and [FePt]95Au5 nanoparticles with an average size of about 4nm were chemically synthesized and spin coated onto silicon substrates. Samples were subsequently thermally annealed at temperatures ranging from 250 to 500°C for 30min. Three-dimensional structural characterization was carried out with small-angle neutron scattering (SANS) and small-angle x-ray diffraction (SAXRD) measurements. For both FePt and [FePt]95Au5 particles before annealing, SANS measurements gave an in-plane coherence length parameter a=7.3nm, while SAXRD measurements gave a perpendicular coherence length parameter c=12.0nm. The ratio of c∕a is about 1.64, indicating the as-made particle array has a hexagonal close-packed superstructure. For both FePt and FePtAu nanoparticles, the diffraction peaks shifted to higher angles and broadened with increasing annealing temperature. This effect corresponds to a shrinking of the nanoparticle array, followed by agglomeration and sintering of the nanoparticles, resulting in the eventual loss of positional order with increasing annealing temperature. The effect is more pronounced for FePtAu than for FePt. Dynamic coercivity measurements show that the FePtAu nanoparticles have both higher intrinsic coercivity and higher switching volume at the same annealing temperature. These results are consistent with previous studies that show that additive Au both lowers the chemical ordering temperature and promotes sintering. en_US
dc.format.mimetype application/pdf en_US
dc.subject Spin coating en_US
dc.subject Particle beams en_US
dc.subject Materials heat treatment en_US
dc.subject Sintering en_US
dc.subject Transition metals en_US
dc.subject X-ray diffraction en_US
dc.subject Nanoparticles en_US
dc.subject Neutron scattering en_US
dc.subject Crystal structure en_US
dc.subject Magnetic anisotropy en_US
dc.title Sintering Behavior of Spin-Coated FePt and FePtAu Nanoparticles en_US
dc.type text en_US

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