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Synthesis of magnetite films on copper substrate by hydrothermal method

Abstract Magnetite (Fe3O4) films on conducting non-magnetic copper substrate were successfully synthesised in a wide temperature range by a simple hydrothermal method. The synthesis utilised FeSO4.7H2O and hydrazine hydrate as starting materials in the presence of KOH for adjusting the pH value to 10. The synthesis was performed in a wide temperature range of 80 to 200°C. The as prepared Fe3O4 films were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). The XRD patterns of the films showed pure phase of Fe3O4 accompanied by copper substrate peaks. The SEM images showed firm, compact and uniform Fe3O4 films with thickness of ∼10 μm. The VSM results presented in plane anisotropic magnetic properties, which further confirms the formation of Fe3O4 films on the copper substrate and thus endows their potential applications in the future.