LAUSR

The present study presents the magnetocaloric effect (MCE) properties of Ni-rich Ni 50− x Co x Mn 38 Sn 12 B 3 ( x  = 0, 1, 3, 5) ribbons during both heating and cooling processes. The Co substitution caused an increase of magnetization difference Δ M and hence an improvement of the MCE. An inverse giant magnetocaloric effect (IMCE) and a high effective refrigerant capacity RC eff were observed in the x  = 3 ribbons. A high amount of Co ( x  = 5) content led to an inverse magnetic entropy Δ S M peak with a wide temperature range. Magnetostructural coupling over a wide temperature range is of great importance for technological purposes. On the other hand, the MCE properties were thermal hysteresis dependent, which has to be considered in the technological applications.