Magnetic Aging in TiO2-doped Mn-Zn Ferrites

•Effect on magnetic properties of TiO2 doping in aged MnZn ferrites is investigated.•Loss by domain wall processes is separated from loss by rotations/resonance.•Average anisotropy constant estimated. Its increase by aging curbed by high TiO2.•Rotational permeability and losses are predicted from Landau-Lifshitz equation.•Domain wall generated loss is increased by aging. Rotational loss is decreased.