Magnetic properties of (Sm,Zr)(Fe,Co)5 alloys produced by the melt-spinning technique

Highlights: • The addition of Zr to the SmFe₅ alloy stabilized the SmFe₅ phase. • The addition of Co to the SmFe₅ alloy also stabilized the SmFe₅ phase. • The addition of both Zr and Co to the SmFe₅ alloy resulted in an increase in coercivity. • The (Sm,Zr)(Fe,Co)₅ alloy exhibited high coercivity without nitrogenation. -- Abstract: The (Sm,Zr)(Fe,Co)₅ alloys were prepared by the melt-spinning technique and subsequent annealing. The substitution of Zr for Sm stabilized the SmFe₅ phase and resulted in a small increase in coercivity, while the substitution of Co for Fe also stabilized the SmFe₅ phase and produced a slightly higher increase in coercivity. The substitution of both Zr for Sm and Co for Fe not only stabilized the SmFe₅ phase but also significantly increased the coercivity. The (Sm,Zr)(Fe,Co)₅ alloy with the optimal annealing temperature and composition exhibited a high coercivity of 4.75 kOe without nitrogenation.