Magnetic, magnetocaloric properties and phenomenological model in amorphous Fe40Ni38Mo4B18 alloy

Abstract We investigate in detail the magnetic, magnetocaloric properties and phenomenological model of amorphous Fe40Ni38Mo4B18 alloy. The melt spinning method has been used to synthesize the amorphous alloy. With a Curie temperature of 610 K, the magnetic transition nature undergoes a second-order magnetic phase transition from ferromagnetic to paramagnetic states. The magnetic entropy change (-ΔSM) is determined using the thermodynamic Maxwell’s relation. Moreover, we report a theoretical investigation of the magnetocaloric effect using a phenomenological model. The best model parameters and their variation with temperature and the magnetic field were obtained. The theoretical predictions were found to be in line with the experimental results.