Effect of Ni substitution on the formability and magnetic properties of Gd₅₀Co₅₀ amorphous alloy

A small amount of Ni was added into the binary Gd₅₀Co₅₀ amorphous alloy to replace Gd in order to obtain ternary Co₅₀Gd_50-xN_x (x= 1, 2, and 3) amorphous alloys. Compared to the binary Gd₅₀Co₅₀ amorphous alloy, the Co₅₀Gd_50-xN_x amorphous alloys show an enhanced Curie temperature (T_C) with a weakened formability. The maximum magnetic entropy change (-ΔS_m^peak) of the Co₅₀Gd_50-xN_x amorphous alloys is found to decrease with the increasing T_C. The adiabatic temperature rise (ΔT_ad) of the Co₅₀Gd₄₇Ni₃ amorphous alloy is superior to that of the Fe-based metallic glasses at room temperature. The variation of the T_C and -ΔS_m^peak of the Gd₅₀Co₅₀ amorphous alloy with Ni addition, and the mechanism involved, were discussed.