Magnetic L-edge EXAFS of 3d elements: Multiple-scattering analysis and spin dynamics

Abstract

Magnetic EXAFS (MEXAFS) adds magnetic selectivity to the well established EXAFS technique opening the door to the exploration of local magnetic structure and disorder. Of particular interest is the behavior of 3d transition metal systems. By utilizing the enhanced L3,2 MEXAFS signal, which is one order of magnitude larger than the K-edge MEXAFS, we performed a temperature dependent study of polycrystalline and epitaxially grown Fe and Co films. By analyzing single and multiple scattering contributions to the helicity dependent data, it is found that there are enhanced multiple scattering contributions in the magnetic case. In addition, we discuss the temperature dependence of the MEXAFS data which is linked to spin fluctuations.