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(a) BSE image of the ribbon plane after electrolytic polishing. (b) Secondary electron image of the cross section. (c) Orientation map showing four types of martensitic variants A, B, C, and D on the ribbon plane.
(a) Heating and cooling DSC curves (upper) and thermal dependence of magnetization M(T) at 5 mT (lower). The vertical dashed lines correlate the start and finish phase transition temperatures (determined from the DSC scans) with the features of the low-field M(T) curves. (b) Isothermal magnetization curves M(H) in the temperature range from 250 to 400 K. (c) Temperature dependence of magnetic entropy change ΔSM (T) at a magnetic field of 2 T and 5 T. The inset shows the field dependence of absolute maximum magnetic entropy change.
(a) Field-up and field-down isothermal magnetization curves. (b) Hysteresis losses at 5 T as a function of temperature across the martensite-to-austenite transformation.
Twinning elements of incommensurate 7M martensite in Ni52Mn26Ga22 ribbons.
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