Large magnetocaloric effect at low magnetic field in Ni _50-xCo_xMn₃₅In₁₅ ribbons

Recently, the magnetocaloric effect (MCE) of Ni-Mn-based Heusler alloys has attracted more attention due to its metamagnetic shape-memory effect. However, most MCE investigations focused on the bulk alloys developed at high magnetic field (≥2 T). In this paper, by employing the melt-spinning technique, a large MCE at low magnetic field was found in a ribbon of Ni _50-xCo_xMn₃₅In₁₅. The magnetic entropy change δS reaches the maximum value of 5.35 J/kg K at 1 T field in the Ni₄₉CoMn₃₅In₁₅ ribbon near room temperature, and its corresponding temperature span arrives 24 K. The refrigerant capacity is enhanced with the increase of the Co substitution. Such a large MCE at low magnetic field in the Ni_50-x Co_xMn ₃₅In₁₅ ribbon with a wide temperature range provides a potential candidate for room temperature magnetic refrigeration.