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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.

physical review b

Fluctuating stress as the origin of the time-dependent magnetostrain effect in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">Mn</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant="normal">Ga</mml:mi></mml:mrow></mml:math>martensites

Fluctuating stress as the origin of the time-dependent magnetostrain effect inNi−Mn−Gamartensites