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The structural, electronic and magnetic properties of small ${\rm Fe}_m {\rmRh}_n$ clusters having $N = m+n \leq 8$ atoms are studied in the framework of ageneralized-gradient approximation to density-functional theory. For $N = m+n\leq 6$ a thorough sampling of all cluster topologies has been performed, whilefor $N = 7$ and 8 only a few representative topologies are considered. In allcases the entire concentration range is systematically investigated. All theclusters show ferromagnetic-like order in the optimized structures. As aresult, the average magnetic moment per atom $\bar\mu_N$ increasesmonotonously, which is almost linear over a wide range of concentration with Fecontent. A remarkable enhancement of the local Fe moments beyond 3 $\mu_B$ isobserved as result of Rh doping. The composition dependence of the bindingenergy, average magnetic moment and electronic structure are discussed.

First-principles study of structural, magnetic and electronic properties of small FeRh alloy clusters