Stress dependence of magnetic shape memory effect and its model

The stress dependence of the magnetic shape memory effect (MSME) in Ni50.7Mn28.4Ga20.9 (number indicates at.%) was studied by simultaneous determination of magnetization reversal M = M (H, σ) and magnetic-field-induced strain ɛ = ɛ (H, σ). The experimental dependence is interpreted within the framework of a simple energy model. The model uses only experimentally observable parameters such as magnetic anisotropy constant, saturation magnetization and twinning stress determined from magnetic measurements and mechanical testing. We show that this simple model correctly describes the MSME as a function of external stress and predict the stress limit of MSME.