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The structural, magnetic, transport, thermal and magnetothermal properties ofquaternary Heusler alloys Ni50Mn38-xFexSb12 have been studied. Powder x-raydiffraction and temperature dependence of magnetization studies reveal thatwith addition of Fe in Mn site, the martensitic transition shifts to lowertemperatures. It is also found that the martensitic transition becomes broaderfor the higher Fe concentrations. The metamagnetic transition in M(H) isothermsbecomes very prominent in x=2 and vanishes for x=3 and 4. A maximum positivemagnetic entropy change of 14.2 J/kg K is observed for x=2 at 288 K for 50 kOe.Resistivity shows an abrupt decrease across the martensitic transition in allthe alloys, except x=6, which does not have the martensitic transition. Maximumnegative magnetoresistance of 21% has been obtained for x=2 at 50 kOe. The samealloy also shows an exchange bias field of 288 Oe.

Effect of Fe substitution on the magnetic, transport, thermal and magnetocaloric properties in Ni50Mn38-xFexSb12 Heusler alloys