Abstract
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.
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