TY - JOUR
T1 - X-ray absorption measurements on nanoparticle systems
T2 - Self-assembled arrays and dispersions
AU - Antoniak, C.
AU - Warland, A.
AU - Darbandi, M.
AU - Spasova, M.
AU - Trunova, A.
AU - Fauth, K.
AU - Aziz, E. F.
AU - Farle, M.
AU - Wende, H
PY - 2010/12/1
Y1 - 2010/12/1
N2 - 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 wet-chemically synthesized 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 L10 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 Fe-oxide nanoparticles in dispersion are presented and ageing effects are discussed on the basis of multiplet calculations.
AB - 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 wet-chemically synthesized 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 L10 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 Fe-oxide nanoparticles in dispersion are presented and ageing effects are discussed on the basis of multiplet calculations.
UR - http://www.scopus.com/inward/record.url?scp=78650102896&partnerID=8YFLogxK
U2 - 10.1088/0022-3727/43/47/474007
DO - 10.1088/0022-3727/43/47/474007
M3 - Article
AN - SCOPUS:78650102896
SN - 0022-3727
VL - 43
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 47
M1 - 474007
ER -