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Information × Registration Number 0302U005149, 0100U003285 , R & D reports Title Investigation of nature and formation mechanism of magnetic properties of high anisotropic ferrimagnet macro- and nanocrystals popup.stage_title Дослідження температурної залежності констант енергії анізотропії заміщених гексаферитових кристалів, збагачених ізотопом 57Fe Head Popkov Yu.A., Registration Date 25-03-2002 Organization Kharkov National University named after V.N.Karazin popup.description2 Subject of inquiry is hexagonal ferrits of M structural type in the form of monocrystals as well as nano- and microcrystal powders. Goal of the 2 stage: determination of the temperature changes in the energy constants of the magnetic anisotropy and dipole sublattice contributions to these constants; elucidation the characteristic features of magnetization processes in the tightly packed systems of disoriented nano- and microcrystals. Methods: magnetostatoc and resonance (NMR) (T = 77-295 K, H less 22 Ke). The dipole contribution of the sublattice to the anisotropy energy constants K1 is determined at low temperatures on the base of experimental data on the local NMR characteristics of Fe3+ ions. An analysis of experimental magnetization curves, made in the context of interparticle magnetic interaction and making use of a computer simulation, allowed to reveal the two additional mechanisms connected with the surface anisotropy which give rise to the characteristic feature of magnetization processes of the different dispersivity powders. Product Description popup.authors popup.nrat_date 2020-04-02 Close