Abstract
In this investigation we show that the optimum substitution of Ni by Co and Cu can bring the martensite transition temperature (TM = 390 K) of Ni46Mn43In11 alloy close to room temperature as well as greatly influence applicable magnetic and transport properties. In contrast to the parent alloy, a ferromagnetic austenite phase is induced in these substituted alloys. A huge exchange bias field of up to 1615 Oe was observed for a field-cooled hysteresis loop at 5 K in the Ni44Cu2Mn43In11 alloy. A giant magnetic entropy change of 20.8 J kg−1K−1 at a field change of 70 kOe and a giant negative magneto-resistance of 57% at ΔH = 30 kOe was also observed for the Ni44Co2Mn43In11 alloy. Possible reasons for the observed behaviours are comprehensively discussed.
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