Influence of Co addition on the magnetic properties and magnetocaloric effect of Nanoperm (Fe1−XCoX)75Nb10B15 type alloys prepared by mechanical alloying

Magnetic properties and magnetocaloric response of mechanically alloyed (Fe1−XCoX)75Nb10B15 (X = 0.15 and 0.30) powders have been studied as a function of crystalline fraction. From X-ray diffraction, it was observed that the amorphization process is delayed with the Co addition in the alloy. Crystallization temperature of the amorphous phase developed during milling decreases as Co content increases. Temperature dependence of magnetization curves shows that the Curie temperature of the amorphous phase increases as the Co content increases. The peak magnetic entropy change slowly increases with Co addition for low crystalline fractions and the refrigerant capacity decreases as Co increases in the alloy.