Magnetocaloric effect in preferentially textured Mn_(50)Ni_(40)ln_(10) melt spun ribbons

摘要

Inverse and direct magnetocaloric properties were evaluated in preferentially textured Mn_(50)Ni_(40)In_(10) ribbons applying the magnetic field H_‖ along the ribbon length and perpendicular H_⊥ to the ribbon plane (△H=30 kOe). Maximum magnetic entropy change, hysteretic losses, and refrigerant capacity were not significantly affected by crystallographic texture. Refrigeration capacity around structural transition is strongly reduced by the large hysteretic losses associated to the metamagnetic field-induced reverse martensitic transformation and narrower working temperature range making the interval around the magnetic transition more efficient for a refrigerant cycle (RC~(stuct)=71 J kg~(-1) versus RC_(eff)~(stuct)≈ 60 J kg~(-1), and RC~(magn) = 89-86 J kg~(-1), for H_‖ and H_⊥, respectively).