Synthesis, magnetic and electromagnetic wave absorption properties of porous Fe₃ O₄ /Fe/ SiO₂ core/shell nanorods

Porous Fe₃O₄ /Fe/ SiO₂ core/shell nanorods were fabricated, in which the diameter of the pores was 5-30 nm. The magnetic and electromagnetic properties were investigated. The temperature dependent magnetic measurements showed that these nanorods were ferromagnetic with a Verwey temperature of 129 K. The electromagnetic data indicated that effective complementarities between the dielectric loss and the magnetic loss were realized, suggesting that they have excellent electromagnetic wave absorption properties. Thus the porous core/shell nanorods could be used as a kind of candidate absorber.