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Manganese ferrite nanoparticles (MnFe 2 O 4 ) were synthesized via surfactant-assisted co-precipitation, where sodium dodecyl sulfate (SDS) was used as the template to control particle size at various SDS concentrations. The substitutions of iron (II) (Fe 2+ ) into the MnFe 2 O 4 ferrite nanoparticles were carried out to obtain Fe (1 - x) Mn x Fe 2 O 4 , with various Mn 2+ : Fe 2+ molar ratios. The synthesized ferrite nanoparticles were characterized by the Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), X-ray diffractometer (XRD), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), two-point probe, and vibrating sample magnetometer (VSM) techniques. The experimental Mn:Fe mole ratios of the Fe (1-x) Mn x Fe 2 O 4 ferrite nanoparticles were verified to be in agreement with the theoretical values. The synthesized MnFe 2 O 4 and Fe (1-x) Mn x Fe 2 O 4 ferrite nanoparticles were of mixed spinel structures, with average spherical particle sizes between 17-22 nm, whereas the magnetite ferrite nanoparticles (Fe 3 O 4 ) were of the inverse spinel structure. They showed soft ferromagnetic behavior. The synthesized Fe 0.8 Mn 0.2 Fe 2 O 4 ferrite nanoparticle possessed the highest saturation magnetization of 88 emu/g relative to previously reported work to date.

Synthesis and Characterization of Fe0.8Mn0.2Fe2O4 Ferrite Nanoparticle with High Saturation Magnetization via the Surfactant Assisted Co-Precipitation