Synthesis, magnetic and dielectric properties of Er-Ni doped Sr-hexaferrite nanomaterials for applications in High density recording media and microwave devices

► A Simple and economic method has been used for synthesis of materials. ► The main aim for substitution of Er-Ni in Sr-hexaferrite is to improve magnetic properties and to reduce the crystallite size. ► We are able to improve the saturation magnetization and remanence with the doping of Er-Ni. ► Crystallite size is in the range 16-14 nm, which is much smaller than that reported earlier. ► Dielectric constant is reduced which makes the material suitable for microwave devices.