Strains induced by magnetic field and phase transformation in Ni50.5Mn26.2Ga23.4 ferromagnetic shape memory alloy.

The article determines the magnetic-field induced strain (MFIS) along the direction of Ni50.5Mn26.2Ga23.4 single crystal at different temperatures. It is interesting to find that the MFIS between the temperature of Ms and Mf is larger than the MFIS below Mf. The specimen used in this study was cut from a bulk single crystal with composition of Ni50.5Mn26.2Ga23.4. The single crystal was grown in the direction according to the cubic parent phase using a Czochralski instrument with a cold crucible system. The magnetic field induced strain was measured by a strain-gauge attached to the sample which was placed in a furnace between the electromagnets.