As a good gyromagnetic material for the applications in microwave and millimeter wave devices, Ba-hexaferrite quasi-single crystals have been successfully fabricated by using its nanosized single-domain crystallites as the starting materials via press-forming in magnetic field and sintering with minor liquid phase participation at 1280 degrees C for 10 h. The material is characterized by a highly densified and laminar fracture microtexture with a grain orientation degree of as high as 99% and shows a single-crystal magnetization behavior featured by 4 pi Ms=4654Gs, H-a=16800 Oe and H-c=120 Oe, suggesting a narrower ferromagnetic resonance linewidth Delta H than the counterpart fabricated by solid-state sintering technique. (C) 2009 Elsevier B.V. All rights reserved.