Microstructure and magneto-dielectric properties of ferrimagnetic composite GdIGX:YIG1−X at radio and microwave frequencies

The gadolinium iron garnet (GdIG, Gd3Fe5O12) and yttrium iron garnet (YIG, Y3Fe5O12), and their GdIGX:YIG1−X composites, were obtained by a new solid-state procedure. The microstructure of the samples was studied by X-ray powder diffraction and Rietveld refinement, Vickers microhardness and scanning electron microscopy. The density and microhardness behavior were studied as a function of the lattice parameters for the composite samples. In the present work, the magnetic and dielectric properties of the GdIGX:YIG1−X composite at radio and microwave frequencies were also studied. The magnetic permeability and dielectric permittivity and loss properties for the composite GdIGX:YIG1−X showed good potential for use in components, when one is looking for moderate εr′ and μr′ materials with low loss in the radio-frequency and microwave range.