Embedded atom contributions to the magnetic EXAFS

Measurements at the L_2/3-edges of Rare-Earth (RE) metallic systems show a smooth low-frequent background on which the magnetic EXAFS are superimposed. While this background is rather strong at the L_2/3-edges it is vanishing at the L₁-edge. It is also not observed at the K-edge of Transition Metals and only very weak in RE oxides. It is shown that the oscillating contribution to the magnetic EXAFS does only depend on the spin-polarization of the neighboring atoms: But the ratio of this low-frequent background at the L₂- and L₃-edges reflect the existence of an orbital momentum similar as it is found in the corresponding near-edge X-MCD.