Structural, Morphological, and Magnetic Properties of Fe2+-Substituted Mn Ferrite Nanoparticles for Biomedical Applications

Fe2+-doped manganese ferrite (Mn1−xFexFe2O4, where x = 0, 0.1, 0.2, 0.4, and 0.6) nanoparticles were synthesized using the co-precipitation method. The structural, morphological, and magnetic properties of the nanoparticles were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy analysis (FESEM), and the vibration sample magnetometer (VSM). The crystallite size and lattice parameter of the samples decreased by increasing the Fe2+-doping concentrations. FESEM study showed the formation of highly agglomerated and isotropic nanoparticles with doping. VSM data revealed the superparamagnetic behavior of nanoparticles with doping. A variation in the saturation magnetization was found; this is directly proportional to the amount of doping for x > 0.2. Low-temperature magnetization studies were carried out at 5 K, revealing an increase in the value of magnetization as well as coercivity due to the freezing of magnetic moments. These results revealedthat the synthesized nanoparticle has different particle sizes and magnetic properties. These nanoparticles have the potential to use in biomedical applications.