Shpetnyy I. Influence of structural-phase state on magnetic, magnetoresistive, magneto-optical and electrophysical properties of heterogeneous nanostructured film systems.

The thesis is devoted to the solution of the scientific problem of the influence of a structural-phase state, size, and concentration effects on physical properties of film magnetic systems on the basis of transitional 3d metals. The regularities of structural state formation, phase composition, magnetic, magnetoresistive, magneto-optical and electrophysical properties of film composition and thickness, matrix material, measurement temperature, and annealing temperature are established for samples of thin film alloys with a thickness of 20 ≤ d ≤ 85 nm. The Levinshtein theory was used to predict the threshold of structural percolation of samples of granular film alloys CoxAg100-x of different thickness (20, 35, 45, and 85 nm), which showed a qualitative agreement between the theory and the experiment. In a three-layer film system of the spin-valve type, the magnetic, magnetotransport and structural characteristics depend on the thickness of the nanolayer of nonmagnetic and magnetic materials. It was experimentally shown, that annealing of samples of two-layer, three-layer films and thin film alloys always leads to changes in magnetic, magnetoresistive and electrophysical properties due to changes in the structural-phase state.