Abstract
A method for investigating the directional short range order (DSRO) of an element of interest in $L$1${}_{0}$ FeMnPt thin films using polarization-dependent x-ray absorption near edge structure (XANES) spectroscopy is described. The XANES calculations for both $L$1${}_{0}$ FePt and $L$1${}_{0}$ MnPt phases indicate that the height of the low-energy shoulder of the polarization-dependent XANES is proportional to the degree of DSRO of the element of interest in the case of $L$1${}_{0}$ FePt and MnPt systems. The experimentally observed DSROs of Fe and Mn in $L$1${}_{0}$ FeMnPt magnetic thin films are consistent with a decrease of ordering parameter with increasing Mn doping. We demonstrate theoretically and experimentally that the heights of the low-energy shoulder in the Fe$K$- and Mn$K$-edge polarization-dependent XANES are proportional to the DSROs of Fe and Mn, respectively.
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