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Abstract
The first experimental evidence of long-range magnetic order in the $c(2\ifmmode\times\else\texttimes\fi{}2)\mathrm{MnCu}(100)$ surface alloy formed by adsorption of 0.5 monolayer of Mn on Cu(100) at room temperature is reported. A carefully prepared $c(2\ifmmode\times\else\texttimes\fi{}2)\mathrm{MnCu}(100)$ surface alloy exhibits a clear x-ray magnetic circular dichroism (XMCD) signal at low temperatures. From the temperature behavior of the XMCD signal, we deduce a Curie temperature ${T}_{c}\ensuremath{\approx}50 \mathrm{K}.$ As for other surfaces containing Mn, we demonstrate that the magnetic properties of the surface alloy are strongly affected by contamination.
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