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Thermo-magnetization curves at different fields, showing the shift of the martensitic transformation with the applied field.
Isothermal magnetization curves at different temperatures, showing the magnetically induced martensitic transformation.
Transformation temperature shifts with the applied field, as deduced from both isothermal and thermo-magnetization curves. The fitting curves are second order polynomials.
Magnetization, ΔM, and entropy, ΔS, changes at the forward and reverse martensitic transformations. Whereas former shows a constant saturated value, the entropy change steadily decreases with the field.
Entropy change at the martensitic transformation, ΔS, as a function of the generalized “order parameter” (T C-T m). Lines are guides to the eyes. The data from Ref. 10 were obtained for a different alloy, so direct correlation between the influence of atomic order and magnetic field is hardly possible, although similar behavior is observed at high magnetic fields.
Inverse entropy change ΔS, as a function of the martensitic transformation width (T ms-T mf) showing good agreement with the behavior predicted by the theory, Ref. 16 .
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