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
Publication Year: 2008
JRC Publication N°: JRC45246
ISSN: 0953-8984
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC45246
DOI: 10.1088/0953-8984/20/21/215230
Type: Articles in Journals
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 Institute:Institute for Transuranium Elements

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