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Typical SEM micrographs of Ni45Fe1Mn43Sn11 as-spun ribbons: (a) fractured cross-section, (b)–(d) free surface of different regions.
Temperature dependence of ZFC and FC magnetization curves M (T) for the annealed Ni46−xFexMn43Sn11 (x = 0–3) ribbons, measured at a field of 200 Oe.
(a) Isothermal magnetization curves for annealed Ni45Fe1Mn43Sn11 ribbons obtained at a field of 50 kOe around TM and TC , (b) Magnetic entropy changes (ΔSM ) of Ni46−xFexMn43Sn11 (x = 0–3) annealed ribbons with temperature at a field of 50 kOe around TM and TC .
Magnetic hysteresis loops in small field region measured at 10 K after FC at 20 kOe of the annealed Ni46−xFexMn43Sn11 (x = 0–3) ribbons, inset shows the variation of the HE and HC as a function of temperature from 10 K to 100 K for the annealed Ni45Fe1Mn43Sn11 ribbons.
The martensitic transformation temperature (TM ), Curie temperature of the austenitic phase (TC ), Curie temperature of the martensitic phase (TCM ), blocking temperature (TB ), the valence electron concentration e/a, magnetic entropy change (ΔSM ), the refrigerant capacity (RC-1 of the +ΔSM , RC-2 of −ΔSM ), EB field (HE ), and coercivity HC for Ni46−xFex Mn43Sn11 (x = 0–3) ribbons.
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