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The crystal structure, magnetic and electrical transport properties of Fe 2 MnSi Heusler alloy have been investigated in the present study. It is found that the sample has been crystallized to the Fm m space group in the L2 1 structure. Ferromagnetic to paramagnetic phase transition (Curie temperature) has been observed at around 325 K, which is further confirmed by employing the Arrott plot technique. Critical exponent values () have been obtained by employing the Kouvel–Fisher method and Widom-scaling relation; confirming the second order phase transition observance in the magnetic transition region. These values suggest that the magnetic transition follows the mean field theory. Furthermore, the electrical resistivity and spontaneous magnetization data analysis in the low-temperature region ensures the presence of magnon in the system. Detailed analysis of the resistivity data for 50 K to 400 K reveals a …