Ni-, Ti-substituted nanocrystalline M-type barium hexaferrite powder (BaNi x Ti x Fe 12−2x O 19 (x=0.4) of size ∼10nm) was coated with Ni-P by electroless (EL) coating technique to form EL Ni-P/BaNi 0.4 Ti 0.4 Fe 11.2 O 19 , a radar absorbing material (RAM) nanocomposite powder. Under TEM, the particle size of RAM powders before and after Ni-P coating were found to be in the range of 10–15nm and 15–25nm respectively. A uniform layer of 5–10nm thick coating is deposited due to the controlled growth of EL Ni-P nanoglobules onto the powder. A growth mechanism was proposed to understand the deposition of EL Ni-P layer onto the RAM powder. The reflection loss (RL) of the EL (Ni-P)/RAM nanocomposite powder in Ku band (12.4 −18GHz) was evidently enhanced to −28.70dB, as compared to the EL Ni-P nanoglobules (−16.20dB) and nanocrystalline RAM powder (−24.20dB). After annealing at 400°C for 4h, the RL and bandwidth of EL (Ni-P)/RAM nanocomposite powder was further improved from −24.20 to −35.90dB and 1.50 to 4.00GHz respectively. The RL enhancement mechanism was explained on the basis of VSM study (hysteresis loops) and electromagnetic theory.