Abstract
By a hydrothermal ferrite plating method, we synthesized Fe3-xCoxO4 (x=0∼1.3) films at temperatures of 90∼180°C and pressures of 15∼40 kg/cm2. The solubility limit of Co increases as temperature increases, from x=∼0.6 at 90°C to x=1.3 at 180°C. All of the films are polycrystalline with no preferential orientation, and the magnetization lies in the film plane. The magnitudes of the saturation magnetization of the films are smaller than those expected for bulk samples, probably because 1) Co2+ ions are oxidized to Co3+ in a nonmagnetic low spin state, and the concentration of Co3+ in the film is higher than that in bulk samples owing to strong oxidizing activity, or 2) nonmagnetic impurity phases exist in the film. The highest value of the coercive force is obtained for films of Fe1.7Co1.3O4 synthesized at 180°C, and reaches ∼1300 Oe.
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