Growth environment dependent phase propagation of ilmenite-hematite (1-x)FeTiO3-xFe2O3 films

초록

We investigated crystal structures, charge ordering, and magnetic properties of ilmenite-hematite (IH) (1-x) FeTiO3-xFe(2)O(3) films grown at various temperatures and oxygen flow rates. The IH solid solution films grown below 650 degrees C without O-2 have weak magnetic moments due to the Fe2+ in the FeTiO3 phase and Fe3+ in the alpha-Fe2O3. The film grown at 650 degrees C without O-2 exhibits the Neel temperature of similar to 60 K and a large magnetic moment due to the Fe2+ ions, resulting from an ordered FeTiO3 phase. Furthermore, the films grown at 650 degrees C under the O-2 have an alpha-Fe2O3 phase separated from FeTiO3 due to excessive O-2 during growth. As a result, the film has weak magnetic moments attributed to Fe3+ in the alpha-Fe2O3 phase. These observations show that the crystal phase and charge ordering are sensitive to the amount of O-2 and responsible for magnetic properties in the ilmenite-hematite system.

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