**4. Conclusion**

In this study we have reported the cobalt ferrites nanocomposites embedded with graphene nanosheets, prepared by co-precipitation method. Various doping of graphene from 0.1% up to 1% were applied within the cobalt ferrite structure to study its microwave and mechanical effects on the nanocomposites. Microwave absorbing capacity of these samples was studied by Agilent network analyzer in low frequency band of microwave (1 MHz to 2 GHz), Results reveals that graphene incorporation not only improved the absorption capacity of cobalt ferrites(13 dB-17d), but also widened its maximum absorption peak. This change was supposed to be due to inhomogeneity and combine effects of electric (graphene), and magnetic dielectric nature (cobalt ferrites). We revealed that

## *Ferrites - Synthesis and Applications*

both the electrical properties and conductivity of cobalt ferrites is improved by imbedding very small amount of graphene nanosheet. Along with improving mechanical properties the graphene also widened the microwave absorption band. So, it is concluded that graphene based ferrites composites may play a vital role for microwave shielding applications.
