  We demonstrate exceptional microwave magnetic performance of
crystallographycally textured barium hexaferrites prepared by conventional
ceramic method. Vibrating sample magnetometer (VSM) and rectangular cavity
perturbation measurements indicate that bulk Ba0.8La0.2Fe11.2Cu0.2O19 samples
exhibit a strong magnetic anisotropy field Ha of 14.6kOe, the highest remanent
magnetization of 3.96kGs, and the lowest ferromagnetic resonance (FMR)
linewidth of 401Oe with zero applied bias field at Q-band. Broadband
millimeter-wave transmittance measurements determined the complex permeability
and permittivity. The remanent magnetization, anisotropy field Ha, and
effective linewidth were also estimated based on Schlomann's theory of the
complex permeability. These calculated values are in good agreement with the
VSM and FMR measurements.
