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We report the observation of giant magneto-caloric effect (MCE) inferromagnetic shape memory alloys (FSMAs) of nominal compositionsNi$_2$Mn$_{1.36}$Sn$_{0.64-x}$Ga$_{x}$ ($x$ =0.24, 0.28 and 0.32). Irrespectiveof the Ga doping, all the samples undergo long range ferromagnetic orderingbelow around 330 K. However, the martensitic transition temperature ($T_{MS}$)of the samples varies strongly with Ga concentration. Clear signature of fieldinduced transition around $T_{MS}$ is visible for all the samples. The observedMCE ($\Delta S$ = 13.6 J/kg K for field changing from 0 to 50 kOe) is found tobe highest for $x$ = 0.28 with peak near 249 K, while $x$ = 0.32 shows $\DeltaS$ = 12.8 J/kg K at 274 K. This series of Ga-doped alloys are found to beinteresting materials with high value of $\Delta S$ over a varied range oftemperature

Giant magneto-caloric effect near room temperature in Ni-Mn-Sn-Ga alloys