Abstract
Well-defined U/Fe multilayers of varying layer thicknesses and bilayer repeat numbers wereprepared by a dc magnetron sputtering method. Polarized neutron reflectometry,off-specular neutron diffraction and magnetic moment measurements were used todetermine the physical properties of the multilayers leading to an evaluation of themagnetic moments associated with the U and Fe atoms. The multilayers exhibitferromagnetic behaviour with the easy axis in the plane of the multilayer. The saturationmagnetization was found to increase with increasing Fe-layer thickness and the magneticmoment averaged over the structured iron layers was below the bulk value of2.2 μB/Fe atom. No anomalies were observed in the magnetization from 4.2 to 375 K intemperature-dependent scans at 0.005 and 0.1 T or in magnetic field scans from 0 to 7 T at4.2 and 295 K. The hysteresis curves exhibited a small degree of perpendicular magneticanisotropy. The Curie temperatures for the multilayers were determined from acsusceptibility measurements and were found to be less than the bulk Fe value of 1043 K.
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