Magnetic properties and promising cryogenic magneto-caloric performances of Gd₂₀Ho₂₀Tm₂₀Cu₂₀Ni₂₀ amorphous ribbons

The magnetic cooling utilizing magneto-caloric effect is recognized as promising energy efficiency and environmentally friendly technology. Here we report a systematical study on the microstructures, magnetic properties and cryogenic magneto-caloric performances of the Gd₂₀Ho₂₀Tm₂₀Cu₂₀Ni₂₀ amorphous ribbons. It is found that the ribbons reveal a second-order phase transition and are accompanied by a table-shaped magneto-caloric effect. The calculated magnetic-entropy-change maximum |∆ S _M|, temperature averaged entropy change (i.e., TEC(10)), and refrigerant capacity reach 13.9 J/kgK, 13.84 J/kgK and 740 J/kg with magnetic field change of 0-7 T, respectively, indicating that the present Gd₂₀Ho₂₀Tm₂₀Cu₂₀Ni₂₀ amorphous ribbons are good candidates for magnetic cooling.