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The addition of Ru to L10 (fct)-FePt thin films was investigated to lower the Curie temperature (T c) of the films, which is beneficial for heat-assisted magnetic recording. The FePtRu films exhibited L10-ordering and perpendicular anisotropy for Ru contents up to at least 18 at. %, and T c was reduced by ∼100 °C/6 at. % Ru independent of the Fe/Pt ratio between 0.8 and 1.1. The T c versus uniaxial magnetic anisotropy diagrams exhibited a linear trend similar to that of FePtCu films but with a larger slope. Systematic analysis clarified that the Ru additive caused a slight decrease of the anisotropic field but greatly decreased the saturation magnetization, which was related to the observed reduction in T c.