Abstract. In this research, graphene oxide (GO) was first synthesized by modified Hummer method, then Ag-CoFe2O4-GO nanocomposite was prepared using solvothermal route. In addition of GO, the starting materials for preparing the nanocomposite were Co(NO3)2.6H2O, Fe(NO3)3.9H2O and AgNO3.The synthesized sample was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). No extra peaks, related to impurity phases were detected in the XRD pattern of GO, confirming the complete oxidation of the graphite powder. Also, the XRD pattern of the prepared nanocomposite revealed that the desired structure had been formed. The crystallite size of the prepared sample was estimated and calculated using Scherrer formula and the size-strain plot (SSP) method. The TEM image of Ag-CoFe2O4-GO nanocomposite showed that the surface of GO sheets has been well decorated by Ag and CoFe2O4 nanoparticles with rather good distribution. Magnetic characterization of the g-CoFe2O4−GO sample was investigated, at room temperature (300 K), in a magnetic field of 15000 Oe. The hysteresis loop indicated that the value of the magnetic saturation (Ms) of the prepared nanocomposite is 31.9 emu g -1, the remnant magnetization (Mr) 3.7 emu g-1 and the coercive force (Hc) of the sample obtained at 106.8 Oe.

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