Magnetic-field-induced strains and magnetic properties of Heusler alloy Ni52Mn23Ga25

Large magnetic-field-induced strain (MFIS) of -2700 ppm has been obtained f rom the Heusler alloy Ni52Mn23Ga25 at 300 K. The temperature for structure transformation was confirmed by three types of magnetic measurements. A bur st of MFIS up to 5400 ppm could be induced by rotating a steady field of 1 T. In the martensitic phase, the material have a high saturated magnetizati on of 66 Am-2/kg and a high anisotropy of 0.8 T. The variant reorientation mainly occurred in the region of 0.2-0.8 T. The large MFIS is sensitive to temperature, suggesting that it can only be induced when martensite and par ent phase are coexisted. (C) 2000 American Institute of Physics. [S0021- 89 79(00)79708-8].