Zn- and Cu-substituted Co2Y hexagonal ferrites: Sintering behavior and permeability

► Preparation of Zn- and Cu-substituted Co2Y hexagonal ferrites. ► Saturation magnetization and permeability increase with Zn-concentration. ► Maximum shrinkage and excellent densification at T≤ 950 °C through substitution of Cu for Co and Bi2O3 addition. ► Partial decomposition at 950 °C leads to decrease of permeability. ► Suited for multilayer inductive devices operating at high frequency