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The adiabatic temperature changes (Δ Tad) in the vicinity of the Curie and martensitic transition temperatures of Ni50 Mn35 In15 and Ni50 Mn35 In14 Z (Z=Al and Ge) Heusler alloys have been studied using an adiabatic magnetocalorimeter of 250-350 K temperature interval for applied magnetic field changes up to ΔH=1.8 T. The largest measured changes were Δ Tad =-2 and 2 K near the martensitic (first-order) and ferromagnetic (second-order) transitions for ΔH=1.8 T, respectively. It was observed that Δ Tad ≈1 K for relatively small field changes (ΔH=1 T) for both types of transitions. The results indicate that these materials should be further explored as potential working materials in magnetic refrigeration applications. © 2011 American Institute of Physics.

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Applied Physics Letters