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The present paper deals with the synthesis of conducting ferromagnetic polyaniline–CoFe₂O₄ (PC) nanocomposites via one-step chemical oxidative polymerization of aniline in the presence of CoFe₂O₄ nanoparticles (30–40nm). These nanocomposites of PC have been characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). Extended thermal analysis has revealed that the activation energy of these nanocomposites varies from 75.3 to 84.3kJ/mol as compared to the activation energy of 50.3kJ/mol for polyaniline-DBSA. In addition, dielectric and microwave absorption properties of the nanocomposites have been measured in the frequency range of 12.4–18GHz (Ku-band) which demonstrate that more than 99% attenuation of microwaves (SE_A …