EMBEDDED-ATOM CONTRIBUTIONS TO THE MAGNETIC EXAFS

Measurements at the L-2/3-edges of Rare-Earth (RE) metallic systems sh ow a smooth low-frequent background on which the magnetic EXAFS are su perimposed. While this background is rather strong at the L-2/3-edges it is vanishing at the L-1-edge. It is also not observed at the K-edge of Transition Metals and only very weak in RE oxides. It is shown tha t the oscillating contribution to the magnetic EXAFS does only depend on the spin-polarization of the neighboring atoms. But the ratio of th is low-frequent background at the L-2- and L-3-edges reflect the exist ence of an orbital momentum similar as it is found in the correspondin g neat-edge X-MCD.