A recently observed phenomenon of the time-dependent deformation of ferromagnetic Ni-Mn-Ga martensites under a stationary magnetic field has been studied. A statistical model describing this phenomenon has been deduced from the mathematical theory of random processes. The influence of the duration of measurement on the shape of strain-field curves has been observed experimentally and interpreted in the statistical model framework of the time-dependent deformation. The evolution of deformation of the Ni-Mn-Ga alloy in the stepwise magnetic field has been considered. Good agreement between the theoretical and experimental results has been achieved for the suitable set of the model parameters.
L'vov, V. A., Rudenko, O., & Glavatska, N. I. (2005). Fluctuating stress as the origin of the time-dependent magnetostrain effect in Ni-Mn-Ga martensites. Physical Review B, 71(2), 024421-1/6. . https://doi.org/10.1103/PhysRevB.71.024421