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SQUID magnetometry and polarised neutron reflectivity measurements have beenemployed to characterise the magnetic properties of U/Fe, U/Co and U/Gdmultilayers. The field dependence of the magnetisation was measured at 10K inmagnetic fields from -70kOe to 70kOe. A temperature dependent study of themagnetisation evolution was undertaken for a selection of U/Gd samples. PNR wascarried out in a field of 4.4kOe for U/Fe and U/Co samples (at roomtemperature) and for U/Gd samples (at 10K). Magnetic 'dead' layers of about 15Angstrom were observed for U/Fe and U/Co samples, consistent with a picture ofinterdiffused interfaces. A large reduction in the magnetic moment, constantover a wide range of Gd layer thicknesses, was found for the U/Gd system (about4 Bohr magnetons compared with 7.63 for the bulk metal). This could beunderstood on the basis of a pinning of Gd moments arising from a column-likegrowth mechanism of the Gd layers. A study of the effective anisotropy suggeststhat perpendicular magnetic anisotropy could occur in multilayers consisting ofthick U and thin Gd layers. A reduction in the Curie temperature was observedas a function of Gd layer thickness, consistent with a finite-size scalingbehaviour.

A study of uranium-based multilayers: II. Magnetic properties