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|Title:||A Study of Uranium-based Multilayers - II. Magnetic Properties|
|Authors:||SPRINGELL R.; ZOCHOWKSI S. W.; WARD R. C. C.; WELLS M. R.; BROWN S.; BOUCHENOIRE L.; WILHELM F.; LANGRIDGE S.; STIRLING W. G.; LANDER G.h.|
|Citation:||JOURNAL OF PHYSICS-CONDENSED MATTER vol. 20 p. 215230|
|Publisher:||IOP PUBLISHING LTD|
|Type:||Articles in periodicals and books|
|Abstract:||SQUID magnetometry and polarized neutron reflectivity (PNR) measurements have been employed to characterize the magnetic properties of U/Fe, U/Co and U/Gd multilayers. The field dependence of the magnetization was measured at 10 K in magnetic fields up to 70 kOe. A reduction in the magnetic moment was found for all systems. Magnetic 'dead' layers of ~15 Å were determined for U/Fe and U/Co samples, indicative of chemically diffuse interfaces. For very thick layers, magnetic moments close to the bulk values were expected. For the U/Gd system, a large reduction in the magnetic moment, constant over a wide range of Gd layer thicknesses, was found (~4 µB compared with 7.63 µB for the bulk metal). A possible explanation for this behaviour, consistent with observations of the structure of these multilayers, is that the Gd moments are pinned at the boundaries of column-like crystallites within the Gd layers. A study of the effective anisotropy and of a finite-size scaling behaviour of the U/Gd system is also presented. PNR data were collected in a field of 4.4 kOe for U/Fe and U/Co samples (at room temperature) and for U/Gd samples (at 10 K). Model calculations of the reflectivities used inputs extracted from the structural survey carried out on these systems, combined with data from the bulk magnetization measurements.|
|JRC Directorate:||Nuclear Safety and Security|
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