Dense composite materials (98.6% of theoretical) consisting of Super Sendust (86.5Fe-6Si-4Al-3.5Ni wt%) and MgFe2O4 (75/25 vol%), which were fabricated by spark plasma sintering for 5 min at 850 degrees C and 130 MPa, exhibit a high saturation magnetization density B-s of 1.2 T and high electrical resistivity rho of 1 x 10(-2) Omega.m. Permeabilities mu >1000 at 1 kHz were obtained. Fine ferrite grains (similar to 0.6 mu m) were located at the boundaries of the large spherical grains of Super Sendust (similar to 30 mu m).