MAGNETIC EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE AT THE L-3,L-2 EDGES OF 3D ELEMENTS

We report normal and magnetic extended x-ray absorption fine-structure (EXAFS) measurements made on 30 ML Fe films on Cu(001) substrates at the L-3,L-2 edges. The magnetic EXAFS at the L edges of 3d metals is p articularly important as it can be used to probe the magnetism of the d states. Magnetic-EXAFS oscillations were detected up to 500 eV above the edge, corresponding to 11.5 Angstrom(-1) in k-space. Over such a large range, we were able to see long-wavelength wiggles and separate them from Fe nearest-neighbour backscattering and the fast oscillation s that had been previously seen. It is shown that without using any de convolution procedure, a meaningful analysis can be performed despite the interference of the L-3 and L-2 edges. The experimental data were compared with the results of multiple-scattering calculations, and thi s enabled us to assign all of the features in both the normal and the magnetic EXAFS Fourier transforms to various single-and multiple-scatt ering paths. Also, there was found to be less temperature-dependent da mping for magnetic EXAFS as than for the normal EXAFS between 75 K and 300 K.