Indirect effect of Si on the ferromagnetic transformation of Mn in FeCoMnAlSi high-entropy soft magnetic alloy

Abstract

In this study, we examined the indirect impact of Si on the ferromagnetic transformation of Mn in (Fe0.8Co0.2)80-xMn10Al10Six (x = 0, 1, 2, 3, 4, & 5 at%) high-entropy soft magnetic alloys. Our findings indicate strong correlation between Si and the ferromagnetic transformation, substantiated by simulation calculations. With Si content increasing the saturation magnetization of the system exhibits a distinctive trend of an initial increase followed by a subsequent decrease. Notably, the coercivity consistently decreases with x increases. Remarkably, when x equals 3, the soft magnetic properties of the system reach an optimal state, characterized by a saturation magnetization of 186.5emu·g-1 and a coercivity of 1.6Oe. The density of states and magnetic moment of the system are obtained by simulation calculation. Notably, the average atomic magnetic moment of Mn (1.642 μB) surpasses that of Co (1.434 μB), suggesting the excellent soft magnetic properties inherent in the system.