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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PEER_stage2_10.1088%2F0022-3727%2F43%2F47%2F474007.pdf (192 Ko)
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