The electrochemical preparation and microwave absorption properties of magnetic carbon fibers coated with Fe3O4 films

► Uniform and compact Fe3O4 films are fabricated on carbon fibers by electrodeposition. ► Composition and morphology of products are influenced by fiber surface pretreatment. ► Microwave property of magnetic fibers varies greatly with preparation temperature. ► Overlarge permittivity adversely affects microwave property of magnetic fibers. ► Magnetic fibers prepared at 75 °C exhibit good microwave absorption property.