Abstract
A combination of dielectric and magnetic materials is expected to demonstrate strong capability of absorbing microwave radiation. In this work, nanocomposite samples made of La1.5Sr0.5NiO4 (LSNO), which has a large dielectric constant, and NiFe2O4 (NFO), which is a typical soft ferrimagnet with high permeability, are prepared and used for measurements in the radar range of 4–18 GHz. The radar absorption capability is characterized by the reflection loss (RL) based on the method proposed by Nicolson – Ross – Weir (hence called NRW method) and the transmission line theory. Lowest RL values of −29.7 dB and −28.5 dB are found for the NFO concentration x = 8 and 30, respectively. Importantly, we observed that the absorption peak shifts to higher frequencies with higher NFO contents, likely due to either the ferromagnetic resonance mechanism or a direct result of the dielectric-magnetic balancing. By attaching a metal (Al) plate to the back of the samples, we are able to observe the phase matching resonance where the reflection signal S11 is almost vanished in the low frequency regime.
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