Abstract
SrFe 12 O 19 /CoFe 2 O 4 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 CoFe 2 O 4 shell is obtained on the surface of SrFe 12 O 19 . 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 SrFe 12 O 19 and CoFe 2 O 4 , 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.
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