Magnetization and magnetocaloric effect in magnetic shape memory alloys Ni-Mn-Ga

摘要

Magnetization of Ni{sub}52Mn{sub}24.4Ga{sub}23.6 and Ni{sub}52Mn{sub}24.2Ga{sub}23.5 magnetic shape memory alloys was measured as a function of magnetic field up to 50 kOe at temperatures in the range 160-390 K. Anomalies of magnetic properties were observed not only at the temperature of martensitic transition T{sub}M, but also at a second transition temperature T{sub}I < T{sub}M. We assume that T{sub}I is associated with an intermartensitic transformation.