Investigation of a magnetic refrigerant DyCo 2 Mn 0.5 near room temperature

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Abstract The development of high-efficiency and environmentally friendly magnetocaloric refrigeration technologies is currently limited by the insufficient energy efficiency of existing room-temperature magnetic materials. Aiming to bridge this gap, this study reports the synthesis of a novel doped intermetallic compound, DyCo 2 Mn 0.5 , and systematically characterizes its magnetic and magnetocaloric properties via first-principles calculations and experimental measurements. Theoretical calculations reveal that Mn doping retained the intrinsic ferromagnetism of the pristine DyCo 2 matrix. At the same time, experimental results demonstrate that Mn incorporation induced the magnetic phase transformation to evolve from first-order into second-order characteristics, accompanied by a substantial increase in Curie temperature from 142 to 294.6 K. The optimized DyCo 2 Mn 0.5 exhibits excellent magnetocaloric performance, which is attributed to the partial substitution of Co sites by Mn atoms. At a magnetic field change of 5 T, the material achieves a maximum magnetic entropy change of 2.25 J/(kg·K) and a refrigeration capacity of 305.1 J/kg. These findings indicate that DyCo 2 Mn 0.5 is a potential candidate for room-temperature magnetic refrigeration cycles.

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