Strong spin-dependent electron correlation effects in photoemission from itinerant magnets

The Fe 2p photoemission of ferromagnetic iron shows a dichroism which indicates a strong difference in hybridization for spin-up and spin-down electrons. In contrast, the dichroism of the localized Mn surface alloys reveals intense unscreened satellite structure. The spin polarization of the core hole is quantified using the dichroism in the Fe L3M2,3M2,3 Auger spectrum measured with the light helicity vector perpendicular to the magnetization direction. The observations in the 3d metals are in strong contradiction with the expectations from an independent-particle model.