Structure and Magnetic Properties of the Spinel-Polymer Composites

The development of the functional magnetic composites with determined properties is important task for modern material sciences. Control of magnetic and electrodynamic properties realized by the ceramic/polymer composites preparation. Conduction of the investigations of the correlation between chemical composition of the fillers (magnetic powders) and their concentration in the polymer matrix is the best way for solving this task. Two- and tree-component spinel-polymer composites were produced by thermal pressing. As spinels, CoFe2O4 (CF) and Ni0.4Cu0.2Zn0.4Fe2O4 (NCZFO) were used. As a polymer, FEP was used. The concentration of the spinels in the polymer matrix was fixed at 20 mass.%. Investigation of the structural features and magnetic properties were carried out. The impact of the chemical composition and phase ratio of the composites on crystal structure, microstructure, and magnetic properties were established. Magnetic measurements were performed at 300 and 10 K in the fields up to 70 kOe. It was demonstrated that the synergetic effect of ceramic composites violates of the principle of additivity in two-phase ceramic composites. The impact of the polymer matrix on magnetic properties was demonstrated. It opens new perspectives for practical applications of such kind of materials.