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The grain orientation of (001)- and (111)-oriented magnetite thin films grown on MgO substrates (film thickness of 100–400nm) is analyzed by means of the electron-backscatter diffraction (EBSD) technique. The (001) surface after a short annealing in air (1min, 250°C) is characterized by the presence of tiny (diameter of 100–200nm) misoriented islands, which have an influence on the antiferromagnetic coupling within the film. In the (111)-oriented films, such defects are found to be absent, and the films show a very homogeneous surface. The achieved spatial resolution enables further a cross-section analysis of a 400-nm-thick film with (001) orientation, even close to the interface MgO-magnetite.

Microtexture of magnetite thin films of (001) and (111) orientations on MgO substrates studied by electron-backscatter diffraction