Single-phase spinel type FeAl₂O₄ and Mn – doped solid solutions of (Fe_1−xMn_x)Al₂O₄ (0 < x ≤ 1.0) powders have been prepared by solid state reaction at 900 ˚C for 6 h in 1.0 % H₂ – bal.N₂ using reactive fine powders of α – Fe₂O₃ (particle size of 0.1 µm^φ), γ – Al₂O₃ (about 10 nm^φ) and MnO (about 0.15 µm^φ). Afrer the powder characterization using XRD, they were densified using pulsed electiric-curuent pressure sintereing (PECPS) at 1050 ˚C for 10 min under 50 MPa in Ar atmossphere. Thus fabricated dense ceramics, having single-phase spinel strucure with the relative desity ≥ 97.0 %, were evaluated by XRD, SEM, and a SQUID magnetometer. They showed antiferromagnetic properties, except for x = 1.0, i.e., MnAl₂O₄ (paramagnetic), and at the compositions of x: 0.4～0.6, Mn – doped solid solutions ceramics revealed moderate high magnetic susceptibility.