Abstract
The magnetic properties of ${\mathrm{Fe}}_{x}{\mathrm{Mn}}_{1\ensuremath{-}x}/\mathrm{Ir}(001)$ superlattices (SL's) have been studied using linearly polarized soft x-ray resonant magnetic reflectivity (XRMS) at the Fe ${L}_{2,3}$ absorption edges. Previous superconducting quantum interference device magnetometry measurements have shown that the SL's exhibit a ferromagnetic behavior for $x>0.75$ and a nonmagnetic or antiferromagnetic one for $x<0.75.$ XRMS measurements were performed on two SL's with compositions on each side of $x=0.75,$ as well as on a thin layer of Fe-rich alloy $(x=0.9).$ The Fe magnetic moments in these alloys were determined by comparing experimental and calculated energy-dependent asymmetry ratios at different angles in the reflectivity curves. Fe atoms are found in a high-spin ferromagnetic state for $x=0.9,$ while they are in a low-spin ferromagnetic state for $x=0.7.$ Our results emphasize the role of the tetragonalization parameter $c/a$ on the occurrence of the different magnetic states. Measurements, at the Mn ${L}_{2,3}$ edges in a bct ${\mathrm{Fe}}_{0.9}{\mathrm{Mn}}_{0.1}$ ultrathin layer reveal a net magnetic moment per Mn atom of about $1.7{\ensuremath{\mu}}_{B}$ coupled antiparallel to the Fe one.
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