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

Abstract

Magnetization of Ni/sub 52/Mn/sub 24.4/Ga/sub 23.6/ and Ni/sub 52/Mn/sub 24.2/Ga/sub 23.8/ 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.