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Anomalous small‐angle X‐ray diffraction of an Nd‐Fe multilayer
Author(s) -
Simon J. P.,
Lyon O.,
Bruson A.,
Rieutord F.
Publication year - 1991
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889890011633
Subject(s) - diffraction , maxima , wavelength , synchrotron radiation , optics , bragg's law , materials science , dispersion (optics) , intensity (physics) , x ray crystallography , photon , kinematics , synchrotron , molecular physics , physics , art , classical mechanics , performance art , art history
The Bragg peak intensities, related to the electronic concentration profile, depend both on atomic concentrations and on specific volumes. Anomalous dispersion, using synchrotron radiation, produces a variation of the scattered intensity, which in principle allows a separation of the two contributions. The kinematic approximation for diffraction of thick multilayers allows an easy evaluation of the ratio of specific volumes, but the entire reflectivity curves and their deformations with photon wavelength can be explained by the interferences between the Kiessig fringes and diffraction maxima in a kinematic approximation. A full optical treatment confirms the previous analysis. Finally, the relaxations occurring during Nd–Fe interdiffusion are too small to be measured in our experimental conditions.