| Summary: | Alloys that are Ni-doped, such as the (Sm<sub>1−y</sub>Zr<sub>y</sub>)(Fe<sub>1−x</sub>Co<sub>x</sub>)<sub>12</sub> and (Ce<sub>0.5</sub>Sm<sub>0.5</sub>)Fe<sub>10</sub>Co<sub>2</sub> systems, are studied because of their magnetic properties. The (Sm<sub>1−y</sub>Zr<sub>y</sub>)(Fe<sub>1−x</sub>Co<sub>x</sub>)<sub>11−z</sub>Ti<sub>z</sub> and (Ce.<sub>1−x</sub>Sm<sub>x</sub>)Fe<sub>9</sub>Co<sub>2</sub>Ti alloys are considered contenders for vastly effective permanent magnets because of their anisotropy field and Curie temperature. Ti can act as a stabilizer for the SmFe<sub>12</sub> compound but substantially suppresses saturation magnetization. To maintain the saturation magnetization in the scope of 1.3–1.5 T, we propose substituting a particular quantity of Fe and Co in the (Sm<sub>1−y</sub>Zr<sub>y</sub>)(Fe<sub>1−x</sub>Co<sub>x</sub>)<sub>12</sub> and (Ce<sub>0.5</sub>Sm<sub>0.5</sub>)Fe<sub>10</sub>Co<sub>2</sub> alloys with Ni. By performing ab initio calculations, we show that Ni incorporation results in increased thermodynamic stability and, in contrast to Ti, has a parallel spin moment aligned to the moment of the SmFe<sub>12</sub> compound and improves its saturation magnetization without affecting the anisotropy field or Curie temperature.
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