Polyacrylamicle/Zn-0 Ni-4(0) 5Cu0 1Fe2O4 (PAM/ZNCFO) composites have been successfully synthesized by in situ polymerization with azobisisobutyronitrile (AIBN) as an initiator Crystal structure morphology and magnetic properties of composites were studied by X-ray diffractometer (XRD) Fourier transform infrared spectroscopy (Fr-IR) transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) Thermal stability and electromagnetic loss of samples was determined by the thermogravimetric analyzer (TG) and the impedance/material analyzer The results showed that electromagnetic properties of the PAM/ZNCFO composites were related to the mass ratio of AM/ZNCFO the polymerization time and temperature (C) 2010 Elsevier B V All rights reserved