Time Decrease of Initial Permeability in MnxFe3−xO4+y

The time decrease of initial permeability has been measured for several stoichiometric and nonstoichiometric compositions of MnxFe3−xO4+y. The samples were in the form of polycrystalline toroids with compositions x =0.5, 0.7, 0.85, and 0.9. The stoichiometric compositions, y = 0, were fired to maint... View More