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We analyse the effects of doping Holmium impurities into the full-Heuslerferromagnetic alloy Co$_2$MnSi. Experimental results, as well as theoreticalcalculations within Density Functional Theory in the "Local DensityApproximation plus Hubbard U" framework show that the holmium moment is alignedantiparallely to that of the transition metal atoms. According to theelectronic structure calculations, substituting Ho on Co sites introduces afinite density of states in the minority spin gap, while substitution on the Mnsites preserves the half-metallic character.

Rare-earth impurities in Co$_2$MnSi: an opportunity to improve Half-Metallicity at finite temperatures