Abstract
To understand the information one can obtain from MEXAFS, we develop a theory of MEXAFS within the spherical wave approximation. We show that the dominant signal is directly proportional to the magnetic moment per atom and smaller than regular EXAFS by an order of magnitude. We show that this explains the observed temperature dependence of MEXAFS. The higher order correlation functions can, in principle, be determined from double scattering paths, but they give contributions which are smaller by another two orders of magnitudes compared to that from the spin moment. Thus MEXAFS can serve as an alternative method for the element specific extraction of total spin magnetic moments. This can be achieved by modification of the regular EXAFS fitting routines and the output of the spin-dependent FEFF8 code.
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