Sea bed logging is new technique for the detection of hydrocarbon reservoir. Magnitude of EM waves is important for the detection of deep target hydrocarbon reservoir below 4000 m from the sea floor. A new aluminium based EM transmitter is developed and NiZn (Ni0.8Zn0.2Fe 2O4) ferrite with and with out multiwall carbon nano tubes (MWCNTs) polymer composites as magnetic feeders are used in a scaled tank. Nickel zinc ferrite plays an important role in many applications due to its best magnetic properties. Nanocrystalline NiZn (Ni0.8Zn 0.2Fe2O4) ferrite and novel Ni 0.8Zn0.2Fe2O4-MWCNTs composites were prepared by sol-gel route. The samples were sintered at 750-950 °C and were characterized by XRD, FESEM, HRTEM and Raman spectroscopy. Single phase of Ni0.8Zn0.2Fe2O4 having 3 1 1 major peak was obtained by sol-gel method at 750 °C and 950 °C. FESEM micrographs show that grain size increases with the increase of sintering temperature and ranges from 24 to 60 nm. FESEM and HRTEM results showed coating of Ni0.8Zn0.2Fe2O4 on MWCNTs and show better morphology at the sintering temperature of 750 °C. The magnetic properties measured from impedance vector network analyzer showed that sample (Ni0.8Zn0.2Fe2O4-MWCNTs) sintered at 750 °C have higher initial permeability (20.043), Q-factor (50.047), and low loss factor (0.0001) as compared Ni0.8Zn0.2Fe 2O4-MWCNTs sintered at 950 °C. Due to better magnetic properties, Sample (Ni0.8Zn0.2Fe2O 4-MWCNTs sintered at 750 °C) composites were used as magnetic feeders for the EM transmitter. It was found that magnitude of EM waves from EM transmitter increased up to 243% by using Ni0.8Zn 0.2Fe2O4-MWCNTs polymer composites. © 2011 Elsevier Ltd and Techna Group S.r.l.