The effect of nonstoichiometry (δ) on the magnetic properties of (Mg0.22Mn0.07Fe0.71)3−δO4 ferrite

The effect of nonstoichiometry (δ) on the magnetic properties of (Mg0.22Mn0.07Fe0.71)3−δO4 ferrite was investigated. The nonstoichiometry was controlled via a solid state electrochemical method to encompass from δ=+0.005 to −0.006. Initial permeability was found to be affected significantly by nonstoichiometry. From the natural resonance frequency in the magnetic loss spectra and initial permeability at low frequencies, magnetocrystalline anisotropy constant (K1) of (Mg0.22Mn0.07Fe0.71)3−δO4 ferrite was calculated as a function of nonstoichiometry, which increased from −1.03×104 to −8.60×103 ergs/cm3 with decreasing nonstoichiometry from +0.005 to −0.006. The effect of nonstoichiometry on the initial permeability of (Mg0.22Mn0.07Fe0.71)3−δO4 ferrite is discussed in terms of saturation magnetization and magnetic anisotropy.