Abstract
A very large helicity dependence of the extended x-ray absorption fine structure (EXAFS) above the L2,3 edges of the ferromagnetic transition metals Fe, Co, and Ni are observed. Transmission measurements of circularly polarized soft x rays through thin films of bcc Fe, hcp Co, fcc Ni, and FexNi1−x alloys deposited on ultrathin, semitransparent substrates show L-edge magnetic EXAFS (MEXAFS) oscillations nearly two orders of magnitude larger than the respective K-edge MEXAFS oscillations. Surprisingly, comparing the EXAFS and MEXAFS oscillations, after separation of the combined L2 and L3 spectra by an iterative deconvolution, show a linear dependence of the MEXAFS intensity on the spin moment of the scattering atom. Furthermore, the resulting fourier transforms show that, for the MEXAFS, the scattering paths traditionally associated with multiple scattering paths are enhanced compared to the L-edge EXAFS, suggesting the increased importance of multiple scattering in MEXAFS.
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