Giant magnetocaloric effect in Ho₁₂Co₇ compound Available to Purchase

Magnetic properties and magnetocaloric effects of Ho₁₂Co₇ compound are investigated by magnetization and heat capacity measurement. The Ho₁₂Co₇ compound undergoes antiferromagnetic (AFM)-AFM transition at T₁ = 9 K, AFM-ferromagnetic (FM) transition at T₂ = 17 K, and FM-paramagnetic transition at T_C = 30 K, with temperature increasing. There are two peaks on the magnetic entropy change (ΔS_M) versus temperature curves and the maximal value of –ΔS_M is found to be 19.2 J/kg K with the refrigerant capacity value of 554.4 J/kg under a field change from 0 to 5 T. The shape of the ΔS_M-T curves obtained from heat capacity measurement is in accordance with that from magnetization measurement. The excellent magnetocaloric performance indicates the applicability of Ho₁₂Co₇ as an appropriate candidate for magnetic refrigerant in low temperature ranges.