  Soft x-ray resonant scattering has been used to examine the charge and
magnetic interactions in the cycloidal antiferromagnetic compound \dyfeal. By
tuning to the Dy $M_4$ and $M_5$ absorption edges and the Fe L(2) and L(3)
absorption edges we can directly observe the behavior of the Dy 4f and Fe 3d
electron shells. Magnetic satellites surrounding the (110) Bragg peak were
observed below 60 K. The diffraction peaks display a complex spectra at the Dy
M(5) edge, indicative of a split 4f electron band. This is in contrast to a
simple resonance observed at the Fe L(3) absorption edge, which probes the Fe
3d electron shell. Temperature dependant measurements detail the ordering of
the magnetic moments on both the iron and the dysprosium antiferromagnetic
cycloids. The ratio between the intensities of the Dy M(4) and M(5) remained
constant throughout the temperature range, in contrast to a previous study
conducted at the Dy L(2,3) edges. Our results demonstrate the ability of soft
x-ray diffraction to separate the individual magnetic components in complicated
multi-element magnetic structures.
