Glass Forming Ability, Magnetic Properties and Magnetocaloric Effect of the Tb65Co25Ni10 Amorphous Tape

In this paper, a ternary Tb65Co25Ni10 amorphous tape was successfully prepared, and the glass forming ability (GFA), magnetic properties, and magnetocaloric characteristics of the amorphous tape were studied in detail. The values of the reduced glass transition temperature Trg, parameter γ and critical section thickness Zc indicate the good GFA of the Tb65Co25Ni10 amorphous tape. The Tb65Co25Ni10 amorphous tape exhibits spin-glass-like behavior, with a Curie temperature of 83 K and a spin-freezing temperature (Tf) of 73 K, and a large coercivity below Tf. The spin-glass-like behavior significantly deteriorates the magnetic entropy change (−∆Sm) of the Tb65Co25Ni10 amorphous tape at low temperatures, resulting in the deviation of magnetic entropy change behavior from the predicted results. However, the Tb65Co25Ni10 amorphous tape still shows an excellent magnetocaloric effect (the peak value of −∆Sm of 9.46 J kg−1 K−1 and the refrigeration capacity of 569.5 J kg−1 under 5 T, both of which are higher than those of most other heavy rare earth-based amorphous alloys), indicating the great application potential in the field of magnetic refrigeration for the amorphous tape.