Structural and Magnetic Properties of CoFe2O4 and CoFe2O4/Fe3O4 nanoparticles
Paper ID : 1118-ICNS
Ozra Musalu, Bagher Aslibeiki *
Department of Physics, University of Tabriz, Tabriz, Iran
One of the most challenging features that researchers have always been interested in, is to easily modify the properties of nanoparticles for their intended applications. The core/shell structure can be very useful for this purpose. Choosing the appropriate core and shell using various materials enables to modify the properties of the nanoparticles. In this work, we synthesized CoFe2O4 ferrite and CoFe2O4/Fe3O4 core/shell nanoparticles by co-precipitation method, then the structural and magnetic properties of the samples were compared using X-ray diffraction, energy dispersion X-ray spectroscopyand a vibrating sample magnetometer system. The Results showed that magnetic properties of coated nanoparticles have changed significantly without noticeable altering of their morphology. The saturation magnetization of CoFe2O4 sample was obtained MS=54.8 emu/g which is smaller than that of bulk ferrite due to presence of disordered spin layer in the surface of nanoparticles. The CoFe2O4/Fe3O4 sample showed MS=67.5 emu/g which is 23% higher than that obtained for single ferrite phase. Despite MS, the coercivity of core/shell sample was 3.3 time smaller than CoFe2O4 sample which was attributed to high magneto-crystalline anisotropy of CoFe2O4 compared to Fe3O4 ferrite.
Nanoparticle; Ferrite; Core/Shell; Magnetization
Status : Abstract Accepted (Oral Presentation)