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Currently, electric motors and generators use high‐energy permanent magnets based on RE2Fe14B phases (RE: rare earth) with high amounts of RE often including heavy‐RE metals (Dy, Tb), the most critical group of the raw materials. REFe12alloys are seen as potential alternatives to RE2Fe14B because they contain a significantly lower amount of RE metals with similar or better values of remanent magnetization (MR) and high magnetocrystalline anisotropy, which can give rise to a large energy product (BH)max. Herein, the effect of heat treatments on the coercivity and magnetic properties on melt‐spun ribbons of SmFe12−xMox(x= 0.5, 1) alloys with wheel speeds of 15 and 35 m s−1is studied. The maximum coercivity after heat treatments is obtained in as‐spun ribbons at a speed of 35 m s−1. For the x= 0.5 ribbons, μ0Hcincreases from 0.06 to 0.36 T, while for the x= 1.0 ones μ0Hcis enhanced from 0.02 to 0.34 T. The highest values of saturation magnetization are obtained for the x= 0.5 ribbons (≈145 Am2kg−1). The effect of heat treatments on the coercivity and magnetic properties on melt‐spun ribbons of SmFe12−xMox(x= 0.5, 1) alloys is studied. The maximum coercivity is obtained in ribbons as‐spun at 35 m s−1. For the x= 0.5 ribbons, μ0Hcincreases from 0.06 to 0.36 T and the highest value of saturation magnetization is obtained for the x= 0.5 ribbons (≈145 Am2kg−1).