Investigations of nanocomposite magnetic materials based on the oxides of iron, nickel, cobalt and silicon dioxide

This paper is concerned with the study of magnetic nanocomposites containing silicon, iron, nickel, and cobalt oxides. These materials were produced in the form of thin films based on Fe–Si–O, Ni–Co–Si–O and Fe–Ni–Co–Si–O systems and powders based on Fe–Si–O, Ni–Si–O, Co–Si–O and Fe–Ni–Co–Si–O systems using sol–gel technology, through centrifugation, and deposition of ammonia solution. The morphology and magnetic properties of materials in the form of thin films were studied by using the atomic force microscopy. The phase composition, specific surface area and magnetic properties of materials in the form of powders were studied by using the X-ray phase analysis, thermal desorption, vibrational magnetometry and immittance measurements. The dependencies of the main parameters were derived for the magnetic materials from their structure and manufacturing conditions. Ways to optimise the technological processes were proposed, aimed at reducing the size of the magnetic particles in an amorphous lattice.