Abstract
The magnetoresistance (MR) behaviour and the magnetocaloric effect (MCE) of the ferromagnetic shape memory alloy of nominal composition Ni2Mn1.36Sn0.64 have been investigated. We observe giant negative MR (∼ − 48% at 90 kOe) around the martensitic transition (MT) temperature. The observed MR was found to be irreversible with respect to the applied magnetic field, particularly in the vicinity of MT. The sample exhibits a large but positive magnetocaloric effect (a peak value of 5.1 J kg−1 K−1 for the magnetic field changing from 0 to 20 kOe) around MT. A comparison with the other Ni–Mn-based shape memory alloys indicates that the observed MR scales with the magnitude of the MCE.
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