Abstract
Heusler alloys with nominal composition Ni73−xFexGa27 (x = 17, 18, 19, 20, 21, 22) were prepared by arc melting and subsequent homogenization by annealing. The magnetic properties of the alloys were studied to analyse the magnetic entropy change as a function of temperature. The maximum entropy change was observed in the alloy (x = 19) where martensite–austenite structural and ferro–para magnetic transitions were very close to each other. The transport properties and magnetoresistance (MR) of the samples were also investigated up to a magnetic field of 8 T and within a temperature range 4.2–325 K. It was observed that the MR in the austenite state was higher than that of the martensite state irrespective of the composition of the sample. A large negative MR (∼9% at 8 T) was obtained for the sample Ni54Fe19Ga27 at 300 K which was very close to the martensitic transition temperature as well as the Curie temperature.
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