MAGNETIC ABSORPTION OF HARD X-RAYS - NEW ASPECTS

The study of magnetic XANES of circularly polarized hard x-rays at the K-edges of 3d- and at the L-edges in 4f- and 5d-elements in ferro(i)m agnetic materials is a. powerful method to study in an element-selecti ve manner magnetic aspects of the electronic structure of solids. It i s demonstrated on the basis of simplified single-particle band-structu re pictures that for the 5d-elements polarized by 3d- neighbors, infor mation on the local spin and orbital moments can be directly deduced f rom the magnetic L2,3-spectra. Although the interpretation of the corr esponding data of the rare earth is much more complicated interesting insights in the variation of their magnetic moment in different chemic al environments and the binding character are possible as shown for Tb /Fe multilayered sample. The first observation of temperature-dependen t changes of the magnetic absorption profile in invar alloys in compar ison with theoretical calculations probe the applicability of magnetic K-edge spectroscopy on spin-fluctuating systems.