Magnetic-field-induced strains and magnetic properties of Heusler alloy [formula omitted]

Abstract

Large magnetic-field-induced strain (MFIS) of −2700 ppm has been obtained from the Heusler alloy [formula omitted] at 300 K. The temperature for structure transformation was confirmed by three types of magnetic measurements. A burst 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 magnetization of 66 Am2/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 parent phase are coexisted. © 2000, American Institute of Physics. All rights reserved.