| Summary: | Ni-doped Sm(Fe<sub>1−<i>x</i></sub>Co<i><sub>x</sub></i>)<sub>12</sub> alloys are investigated for their magnetic properties. The Sm(Fe,Co)<sub>11</sub><i>M</i><sub>1</sub> compound (<i>M</i> acts as a stabilizer) with the smallest (7.7 at.%) rare-earth-metal content has been recognized as a possible contender for highly efficient permanent magnets thanks to its significant anisotropy field and Curie temperature. The early transition metals (Ti-Mn) as well as Al, Si, and Ga stabilize the SmFe<sub>12</sub> compound but significantly decrease its saturation magnetization. To keep the saturation magnetization in the range of 1.4–1.6 T, we suggest replacing a certain amount of Fe and Co in the Sm(Fe<sub>1−<i>x</i></sub>Co<i><sub>x</sub></i>)<sub>12</sub> alloys with Ni. Ni plays the role of a thermodynamic stabilizer, and contrary to the above-listed elements, has the spin moment aligned parallel to the spin moment of the SmFe<sub>12</sub> compound, thereby boosting its saturation magnetization without affecting the anisotropy field or Curie temperature.
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