Abstract
In the work reported here, NiCo2O4 films were grown epitaxially on LaAlO3 (111) substrates at temperatures between room temperature and 700 °C. The effects of the substrate temperature (Tsub) on the structural, electrical and magnetic properties and on the Hall effect of the film were investigated. Tsub has a great influence on the cation disorder. High Tsub makes substitution of Ni (Oh) for Co (Td) easier, and changes the relative Ni3+/Co3+ concentration. The film grown at 400 °C had a relatively larger concentration of Ni3+, which lowers the resistivity and enhances the ferrimagnetism of the NiCo2O4 film. In addition, a sign change in the Hall coefficient from negative to positive was observed with increasing measurement temperature for each of the samples grown at different substrate temperatures.
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