Abstract
This work reports the magnetocaloric properties in a Si-doped, Mn-rich Mn46Ni39.5Sn10Si4.5 alloy in the aspects of different measurement protocols across its martensitic and reverse transition. A good agreeable value of the magnetic entropy changes (ΔSM ∼ 20 J/kg K due to a ΔH = 50 kOe) along with large refrigerant capacity (RC ∼ 110 J/kg) has been obtained from the high field M-T measurements, which can be a very handy tool for magnetocaloric study. We have analyzed the field dependent magnetization data during heating and cooling near the structural transition for different field changes and fitted them universally using a Lorentz function. The isothermal measurement by ramping the temperature discontinuously during cooling is found to be one of the most convenient and energy efficient ways to minimize the field induced losses, which helps to achieve a very high RC in similar materials exhibiting first order phase transition. A significant amount of zero field cooled exchange bias field (∼720 Oe at 5 K) and magnetoresistance (∼−25% due to a ΔH = 80 kOe) has also been achieved from this sample.
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