Synthesis and characterization of SrFe12O19/CoFe2O4 nanocomposites with core-shell structure

SrFe12O19/CoFe2O4 nanocomposites with core-shell structure were successfully synthesized with two-step coprecipitation method. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Raman spectroscopy, vibrating sample magnetometer (VSM) and radar absorbing material reflectivity far field radar cross-section method, respectively. XRD and TEM results show that CoFe2O4 shell is obtained on the surface of SrFe12O19. And Raman spectra confirm the core-shell structure of the nanocomposites. The magnetic properties and microwave absorption analyses reveal that there are interphase interactions at the interface of SrFe12O19 and CoFe2O4, which can affect the magnetic properties and microwave absorption properties of the samples. Compared with core material, the coercivity and saturation magnetization of core-shell nanocomposites decrease obviously, but the microwave absorption properties of nanocomposites are improved greatly. (C) 2008 Elsevier B.V. All fights reserved.