Textured Sc-doped barium-ferrite compacts for microwave applications below 20 GHz

Sc is substituted for Fe in Ba M-type hexaferrite to reduce the anisotropy field and shift the ferromagnetic resonance (FMR) frequency to below 20 GHz. We have produced pure phase BaFe11 ScO19 powders having a platelet microstructure. These materials are pressed under an applied magnetic field of 95.5 X 10(5) A/m. Resulting compacts are sintered and are shown to have a clear uniaxial anisotropy with the c-axis perpendicular to the surface plane. Hysteresis loops display a squareness of 0.83 with a coercivity of similar to 186 kA/m. The X-band FMR power derivative linewidth is measured to be 79.6 kA/m.