Magnetostrain and magnetization of the Ni-Mn-Ga single crystal

6.2% and 5.8% giant magnetic field induced strains (MFIS) are achieved along two different orthogonal directions of a Ni₅₀Mn_27.5Ga_22.5 single variant sample with a switching magnetic field of 2.4 kOe. A "magnetization jump" effect is observed along an initially hard direction at the switch field of the magnetostrain. A high saturation magnetization of 71.3 emu/g and magnetocrystalline anisotropy of 1.8 × 10⁵ J/m³ are tested in the near single variant sample. The Zeeman energy is calculated to be 1.4 × 10⁵ J/m³, close to the mechanical deformation energy of 1.2 × 10⁵ J/m³, which is regarded as the driving force of the twin boundaries motion. The temperature dependence of the magnetostrain is also investigated in a wide temperature range from -194 K to 290 K. Furthermore, powder X-ray diffraction pattern of Ni₅₀Mn_27.5Ga_22.5 demonstrates 5M tetragonal modulated martensite at room temperature.