Temperature and magnetic field dependence of permeability in amorphous magnetic materials

In this paper, the temperature and magnetic field dependence of permeability, $\mu$, in Fe$_{100-x} - B_x$ ($x = 18$, 20, 22), Fe$_{78}$B$_{14}$Si$_8$ and Fe$_{62}$Ni$_{16}$B$_{14}$Si$_8$ are studied. After annealing up to Curie temperature, Fe$_{80}$B$_{20}$ and Fe$_{78}$B$_{22}$ alloys become crystalline, while other alloys remain amorphous. The Curie temperatures were measured. The DC magnetic field dependence of the permeability shows that the approach to saturation is modified by annealing