  We present theoretical and experimental data on the magneto-optical
contributions to the complex refractive index in the extreme ultraviolet (XUV)
range covering the 3p resonances of Fe, Co, and Ni. Comparing the spectra from
density functional theory with magnetic circular dichroism measurements we find
that many body corrections and local field efects are of crucial importance for
accurate description of the spectra. Our results are relevant for the
application of static XUV spectroscopy for multi element magnetic systems as
well as for the investigation of ultrafast magnetization dynamics.
