RESONANT X-RAY REFLECTIVITY MEASUREMENTS OF A MAGNETIC MULTILAYER [GDFE](10)/

Resonant X-ray reflectivity intensities were collected at different X- ray energies near absorption edges in order to get element-specific de nsity profiles for a (Gd/Fe)(10) multilayer. By fitting the measured r esonant X-ray reflectivity curves simultaneously, atomic density profi les of Gd and Fe were determined. X-ray reflectivity intensities were also measured for elliptically polarized X-rays at Gd L-2, and L-3, ed ges with magnetic fields parallel and antiparallel to the helicity of the X-rays. Asymmetry ratios between the reflectivity intensities with opposite magnetic field directions were calculated from the obtained density profiles and compared with data. (C) 1998 Published by Elsevie r Science B.V. All rights reserved.