Sintering behavior of spin-coated FePt and FePtAu nanoparticles

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dc.contributor.authorKang, SS
dc.contributor.authorJia, Z
dc.contributor.authorZoto, I
dc.contributor.authorReed, D
dc.contributor.authorNikles, DE
dc.contributor.authorHarrell, JW
dc.contributor.authorThompson, G
dc.contributor.authorMankey, G
dc.contributor.authorKrishnamurthy, VV
dc.contributor.authorPorcar, L
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherUnited States Department of Energy (DOE)
dc.contributor.otherOak Ridge National Laboratory
dc.contributor.otherNational Institute of Standards & Technology (NIST) - USA
dc.date.accessioned2018-11-13T14:40:48Z
dc.date.available2018-11-13T14:40:48Z
dc.date.issued2006-04-19
dc.description.abstractFePt and [FePt](95)Au-5 nanoparticles with an average size of about 4 nm were chemically synthesized and spin coated onto silicon substrates. Samples were subsequently thermally annealed at temperatures ranging from 250 to 500 degrees C for 30 min. 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](95)Au-5 particles before annealing, SANS measurements gave an in-plane coherence length parameter a=7.3 nm, while SAXRD measurements gave a perpendicular coherence length parameter c=12.0 nm. 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. (C) 2006 American Institute of Physics.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationKang, S., et al. (2006): Sintering Behavior of Spin-Coated FePt and FePtAu Nanoparticles. Journal of Applied Physics, 99(8). DOI: https://doi.org/10.1063/1.2165789
dc.identifier.doi10.1063/1.2165789
dc.identifier.orcidhttps://orcid.org/0000-0003-3163-5159
dc.identifier.orcidhttps://orcid.org/0000-0003-3163-5159
dc.identifier.orcidhttps://orcid.org/0000-0002-0116-7166
dc.identifier.urihttp://ir.ua.edu/handle/123456789/4911
dc.languageEnglish
dc.language.isoen_US
dc.publisherAmerican Institute of Physics
dc.subjectMAGNETIC-PROPERTIES
dc.subjectPhysics, Applied
dc.subjectPhysics
dc.titleSintering behavior of spin-coated FePt and FePtAu nanoparticlesen_US
dc.typetext
dc.typeArticle

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