Synthesis and characterization of Cu/YIG nanoparticles- Terahertz material

Copper/Yttrium Iron Garnet (Cu/YIG) nanoparticles (NP) were prepared using the in situ method to understand how the amount of copper affects their structural, electrical, and magnetic properties. Structural analysis using XRD determined that all samples have a single cubic crystal structure with the general formula A3B5O12. At room temperature, the complex permittivity (& epsilon;), complex permeability (& mu;), and S-parameter were measured as a function of frequency. When there is a high amount of copper, the dielectric loss is dominated by conduction and polarization. The results suggest that conduction occurs through the grain boundaries in these samples. The complex permeability measurements at room temperature indicate that the permeability decreases with increasing amounts of copper. This may be due to the difference in magnetic moment between the copper and iron ions. The Cu/YIG nanocomposites with a tunable negative dielectric constant have great potential in electromagnetic damping, shielding, and antenna fields.