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 T-rg and gamma 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 (T-c) of the amorphous alloy was similar to 79 K and the typical spin-glass-like behavior was found in the alloy. The peak value of magnetic entropy change (-Delta(peak)(m)) for the amorphous alloy was up to 9.47 J kg(-1) K-1 under 5 T. The mechanism for the increased T-c and enlarged -Delta S-m(peak) of the Tb65Ni15Co20 amorphous alloy was analyzed.