Tb-doped BiFeO 3 multiferroics nanoparticles fabricated via micro-emulsion route were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The fully characterized Tb x Bi 1−x FeO 3 nanoparticles were then subjected to magnetic behavior evaluation for various technological applications. The thermogravimetric analysis (TGA) conducted in the range 25–1000°C predicted the temperature (~960°C) for phase formation. XRD estimated the crystallite size 30–47nm, while the particles size estimated by SEM was found (80–120nm). The XRD data confirmed the rhombohedral (space group R3c) phase with average cell volume 182.66Å 3 (for BiFeO 3 ). Various other physical parameters like bulk density, X-ray density and porosity were also determined from the XRD data and found in agreement with theoretical predictions. The magnetic studies showed that as Bi 3+ was substituted by Tb 3+ , all magnetic parameters were altered. The maximum saturation magnetization (M s ) (0.6691emug −1 ) was exhibited by Tb 0.02 Bi 0.98 FeO 3 while the Tb 0.00 Bi 1.00 Fe 1.00 O 3 showed the maximum (549Oe) coercivity. The evaluated magnetic behavior categorized these materials as soft magnetic materials that may be useful for fabricating advanced technological applications.