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Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2010

X-ray absorption measurements on nanoparticle systems: self-assembled arrays and dispersions

Résumé

X-ray absorption spectroscopy methods are presented as a useful tool to determine local structure, composition and magnetic moments as well as to estimate the effective anisotropy of substrate supported self-assembled arrays of wetchemically synthesised FePt nanoparticles: A compositional inhomogeneity within the nanoparticles yields reduced magnetic moments with respect to the corresponding bulk material and may also hinder the formation of the chemically ordered L1 0 phase in FePt nanoparticles. The latter is indicated by a reduced effective anisotropy, which is one order of magnitude smaller than expected from the known value of the corresponding bulk material. As a new approach, measurements of the x-ray absorption near-edge structure of Feoxide nanoparticles in dispersion are presented and ageing effects are discussed on the basis of multiplet calculations.

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Dates et versions

hal-00570717 , version 1 (01-03-2011)

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C Antoniak, A Warland, M Darbandi, M Spasova, A Trunova, et al.. X-ray absorption measurements on nanoparticle systems: self-assembled arrays and dispersions. Journal of Physics D: Applied Physics, 2010, 43 (47), pp.474007. ⟨10.1088/0022-3727/43/47/474007⟩. ⟨hal-00570717⟩

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