Effects of Rare Earth Metal Oxides Addition on Magnetic Properties of MnZn Ferrite Single Crystals

Abstract

We found out that the addition of various rare earth metal oxides (Ce₂O₃, Pr₂O₃, Eu₂O₃, Dy₂O₃, Ho₂O₃, Er₂O₃, Yb₂O₃) have improved both the saturation magnetization(σs) and the relative perme-ability(μr') of Mn-Zn ferrite single crystals. Fspecialy, the σs shows the maximum value of 10.56×10_-3Wbkg_-1 when 0.05mol% Er₂O₃ is added to Mn_0.54Zn_0.35Fe_2.10O₄.It is considered that the effect of the Er₂O₃ addition on magnetic properties is closely related to the dissolution of Er into the Mn-Zn ferrite. The Mn-Zn ferrite containing Er₂O₃ is expected to be used as magnetic head materials.