Magnetic nanoparticles for components of MRI diagnostics and electronic devices

The formation of single-phase solid solutions iron oxide and manganese with a spinel structure in MnxFe3 – xO4 system (x = 0; 0.3; 0.6; 0.8; 1.0; 1.2; 1.4; 1.8) has been established by methods X-ray phase analysis infrared spectroscopy. maximum saturation magnetization was found for the composition Mn0.3 Fe2.7O4 (Ms 68 A ⋅ m2 kg−1 at 300 K Ms 85 5 K), which is associated change cationic distribution over tetrahedral octahedral voids. materials obtained were stabilized form colloidal using number polyelectrolytes. It that poly(diallyldimethylammonium chloride) (PDDA) had best stabilizing effect due to its structural features. method controlling magnetic properties magnetite partial replacement ions proposed. Changing magnitude coercive force possible changing degree substitution. Relatively high values specific magnetization, as well uniformity particles size, can be practical interest, manufacture contrast agents MRI diagnostics.