Abstract: Barium hexaferrite (BaFe₁₂O₁₉, BaM) with large uniaxial magnetocrystalline anisotropy is a key gyromagnetic material for the millimeter wave device. BaM quasi-single crystal materials with a grain orientation degree(GOD) of 99% were successfully fabricated by using nanosized single-domain BaM crystallites as the starting materials via press-forming in magnetic filed and sintering with minor liquid participation. The as-fabricated BaM quasi-single crystals were characterized with the saturation magnetization of 4654kA/m, the coercity field of 9.552kA/m and their formation mechanism was also discussed.

Key words: Ba-hexaferrite, gyromagnetic ferrites, quasi-single crystal structure, liquid participation sintering