Title: Chemical and Magnetic Structure of Uranium/Gadolinium Multilayers Studied by Transmission Electron Microscopy, Neutron Scattering and X-Ray Reflectivity
Authors: SPRINGELL R.LANGRIDGE S.WILDES A.WILKINS S.b.SANCHEZ-HANKE C.MOORE K. T.BUTTERFIELD M.CHIVALL J.WARD R.c.c.WELLS M.r.LANDER G.h.
Citation: PHYSICAL REVIEW B vol. 81 no. 13 p. 134434 (1-13)
Publisher: AMER PHYSICAL SOC
Publication Year: 2010
JRC Publication N°: JRC58757
ISSN: 1098-0121
URI: http://link.aps.org/doi/10.1103/PhysRevB.81.134434
http://publications.jrc.ec.europa.eu/repository/handle/JRC58757
DOI: 10.1103/PhysRevB.81.134434
Type: Articles in Journals
Abstract: We present a multitechnique approach to study the detailed chemical and magnetic structure of uranium/gadolinium multilayers. At low temperature the saturation magnetization is found to be 60% of that of bulk gadolinium. We address this problem, which is found in many other multilayers and suggest a model that may have wider applications. transmission electron microscopy images indicate a microstructure, consistent with a columnar growth of Gd with crystallites of the order 20¿100 Å. Off-specular neutron scattering is most strongly visible at saturation field, indicating that Gd moments are not aligned with the applied field. X-ray resonant magnetic scattering provides proof of coupled in-plane length scales for both the structural and the magnetic roughness. A detailed x-ray scattering study of both the specular and off-specular reflectivities has been used to investigate the in-plane structure of the multilayers. We calculate the roughness and transverse correlation cut-off length, x=120+/-30 Å, and present a simple model to determine an average column size of 27+/-6 Å and a reduction in the magnetic saturation of ~40%.
JRC Institute:Institute for Transuranium Elements

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