Heat generation ability in AC magnetic field of nano MgFe2O4-based ferrite powder prepared by bead milling

►The crystal and particle size for MgFe2O4 based ferrite were decreased by bead milling. ►The highest heat ability was obtained for MgFe2O4 having a ca. 6 nm crystal size. ►This high heat generation ability was ascribed to the increase in hysteresis loss. ►Hysteresis loss was increased by the formation of a single domain.