Abstract
We have employed the x-ray resonant magnetic scattering (XRMS) technique at the Ru ${L}_{2}$ edge of the Ba(Fe${}_{1\ensuremath{-}x}$Ru${}_{x}$)${}_{2}$As${}_{2}$ ($x=0.205$) superconductor. We show that pronounced resonance enhancements at the Ru ${L}_{2}$ edge are observed at the wave vector which is consistent with the antiferromagnetic propagation vector of the Fe in the undoped BaFe${}_{2}$As${}_{2}$. We also demonstrate that the XRMS signals at the Ru ${L}_{2}$ edge follow the magnetic ordering of the Fe with a long correlation length, ${\ensuremath{\xi}}_{ab}>2850\ifmmode\pm\else\textpm\fi{}400$ \AA{}. Our experimental observation shows that the Ru is spin polarized in Ba(Fe${}_{1\ensuremath{-}x}$Ru${}_{x}$)${}_{2}$As${}_{2}$ compounds.
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