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In order to study a new microwave absorbing properties in the X-band frequency range, magnetic materials of BaFe12O19 and BaFe10CoZnO19 were synthesized by ceramic method. Microwave absorbing properties of multi nanolayer absorbers, composed of BaFe12O19 and and BaFe10CoZnO19 with a total thickness of 1 mm, 2 mm and 5 mm, were characterized at room temperature using vector network analyzer (VNA) Rohde‐Schwarz ZVA 67 to measure the reflected signal (S11) and transmitted signal (S21) for 7 – 13 GHz frequencies. Reflection loss (RL) of multi nanolayer magnetic materials were calculated using the transmit line theory. The RL of microwave radiations from multilayer magnetic materials is calculated and strongly depends on thickness of multi nanolayer absorbers and showed an optimal RL.