Abstract
The field dependences of the magnetic moment of polycrystalline magnetite films formed by pulsed laser deposition on a silicon substrate with the addition of an iron sublayer have been investigated. The influence of the sequence of layers Fe/Fe3O4 and Fe3O4/Fe on the magnetic characteristics of these structures has been analyzed. It has turned out that an increase in the saturation magnetization and the formation of a rectangular hysteresis loop with the coercive force acceptable for applications of thin-film magnetite as a hard magnetic electrode of the magnetic tunnel junction are observed only for the sequence of layers Fe/Fe3O4. The effect of the vacuum annealing temperature on the magnetic properties of polycrystalline samples of the Fe/Fe3O4 structure has been studied. It has been found that the best result is achieved at an annealing temperature of 500°C. The phenomenological model describing the magnetic properties of the polycrystalline two-layer magnetic structure Fe/Fe3O4 has been formulated. The results of numerical calculations have demonstrated that the introduction of only two phenomenological anisotropic interactions into the expression for the energy of the film provides a qualitative description of the observed experimental data in the form of hysteresis loops.
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Original Russian Text © A.V. Anisimov, A.Yu. Goikhman, G.S. Kupriyanova, V.N. Nevolin, A.P. Popov, V.V. Rodionova, 2012, published in Fizika Tverdogo Tela, 2012, Vol. 54, No. 6, pp. 1084–1089.
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Anisimov, A.V., Goikhman, A.Y., Kupriyanova, G.S. et al. Change in the magnetic properties of polycrystalline thin-film magnetite upon introduction of an iron sublayer. Phys. Solid State 54, 1153–1159 (2012). https://doi.org/10.1134/S1063783412060030
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DOI: https://doi.org/10.1134/S1063783412060030