Exchange-coupled hard-soft ferrites; A new microwave material

With recent advances in nanostructure synthesis techniques, we have realized a thin nano-composite layer on top of coplanar waveguide (CPW) planar transmission lines to design microwave notch-filters. Using a vector network analyzer we have checked the device operation from X-to Ka-band through ferromagnetic resonance (FMR) spectroscopy. The FMR linewidth (device bandwidth) is observed to be tunable with (BaM)1-x (YIG)x nanocomposite from 2 kOe (900 MHz) for pure BaM (x = 0) to 0.2 kOe (90 MHz) for pure YIG (x = 1). Various mathematical models were employed to fit the experimentally observed FMR linewidth (ΔH) data to yield intrinsic and extrinsic damping parameters as a function of 'x' value in (BaM)1-x (YIG)x nanocomposite.