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|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|
|Type:||Articles in periodicals and books|
|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 Directorate:||Nuclear Safety and Security|
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