Glass Forming Ability, Magnetic Properties and Magnetocaloric Effect of the Tb65Ni15Co20 Amorphous Alloy

In the paper, Tb65Ni35−xCox (x = 0, 10, 20, 30) amorphous ribbons were successfully prepared, and the glass-forming ability (GFA) of these ribbons was investigated. Both the Trg and γ of the Tb65Ni35−xCox amorphous ribbons were larger than those of the Tb65Ni35 alloy and reached the maximum when x = 20, indicating that the Tb65Ni15Co20 amorphous alloy has an optimal GFA. The magnetic properties as well as magnetocaloric effect of the Tb65Ni15Co20 amorphous alloy were studied. The Curie temperature (Tc) of the amorphous alloy was ~79 K and the typical spin-glass-like behavior was found in the alloy. The peak value of magnetic entropy change (−∆Smpeak) for the amorphous alloy was up to 9.47 J kg−1 K−1 under 5 T. The mechanism for the increased Tc and enlarged −∆Smpeak of the Tb65Ni15Co20 amorphous alloy was analyzed.