MnZn-based ferrite and method for producing same

Provided are: a MnZn ferrite which is capable of suppressing both a reduction in loss at high frequencies and a change in magnetic characteristics in a high magnetic field; and a method for producing the MnZn ferrite. The MnZn-based ferrite contains Fe2O3, ZnO, and MnO as main components, in which, in 100 mol% of the main components, Fe2O3 is 53.2 to 56.0 mol% and ZnO is 3.0 to 12.0 mol%, with the remainder being MnO, the MnZn-based ferrite contains, as sub-components, 0.005 to 0.060 mass% of SiO2, 0.010 to 0.060 mass% of CaO, 0.10 to 0.40 mass% of Co2O3, and 0.05 to 0.30 mass% of TiO2 with respect to 100 mass% of the main components, the average crystal grain size is 4 [mu] m or less, and the sintering density is 4.8 g/cm3 or more. 提供了一种MnZn系铁氧体及其制造方法，其能够抑制高频下损耗的减小和高磁场中磁特性的变化两者。所述MnZn系铁氧体包含作为主成分的Fe2O3、ZnO和MnO，其中，在100mol％的主成分中，Fe2O3为53.2至56.0mol％并且ZnO为3.0至12.0mol％，余量为MnO，相对于100质量％的主成分，MnZn系铁氧体包含作为副成分的0.005至0.060质量％的SiO2、0.010至0.060质量％的CaO、0.10至0.40质量％的Co2O3、和0.05至0.30质量％的TiO2，平均晶体粒径为4μm以下，并且烧结密度为4.8g/cm3以上。