The effect of hydrostatic pressure on martensitic transition and magnetocaloric effect of Mn44.7Ni43.5Sn11.8 ribbons

The effect of hydrostatic pressure on the martensitic transformation and magnetocaloric effect has been systematically studied in Mn44.7Ni43.5Sn11.8 ribbons. The melt-spun ribbons crystallize along the [400] direction, which is perpendicular to the surface of the ribbon. The martensitic transformation temperatures shift from 266.5 K to 281.0 K by applying hydrostatic pressure of 0.75 GPa. Under the magnetic field of 30 kOe, the value of dTM/dP is about 19.3 K GPa−1, indicating a broadening of working temperature span for magnetic refrigeration at room temperature. At ambient pressure, a relatively large entropy change value of 35.9 J kg−1 K−1 is obtained under a magnetic field of 30 kOe, which would be related to the orientation of crystal structure. •Highly textured Heusler alloy Mn44.7Ni43.5Sn11.8 ribbons were prepared by melt spinning.•In contrast with other non-stoichiometric Ni-Mn-Sn compounds, a relatively lager value of dTMS/dP of 19.3 K GPa-1 is obtained.•A relatively large entropy change value of 35.9 J kg-1 K-1 is obtained under a magnetic field of 30 kOe.