Magnetic extended x-ray absorption fine structure at the L-3,L-2 edges of Fe and Co on Cu(001)

We report magnetic extended x-ray absorption fine structure (EXAFS) measure ments on 30 monolayer Fe and Co films on Cu(001) substrates at L-3,L-2 edge s. For 3d transition metals, the magnetic EXAFS at the L edges is of great interest since it probes final d states which mainly contribute to magnetis m. Magnetic EXAFS oscillations were detected up to 500 eV above the edge co rresponding to 11.5 Angstrom(-1) in k space. Over such a large range, the l ong wavelength wiggles from the Fe and Co nearest neighbor backscattering a nd previously observed fast oscillations are clearly seen. It is shown that without using any deconvolution procedure a meaningful analysis can be per formed despite an interference of L-3 and L-2 edges. In the case of Fe, exp erimental data are compared with multiple-scattering calculations. (C) 1998 American Institute of Physics. [S0021-8979(98)50211-3].