Figure 1

(a) HRTEM overview image of the Fe₃O₄/SrTiO₃ heterostructure showing uniform film thickness of ~80 nm and a sharp interface between film and substrate. (b) SAD pattern from the interface region. The Fe₃O₄ and SrTiO₃ motifs are outlined (Fe₃O₄ in red, SrTiO₃ in green). (c,d) show SAD simulations of Fe₃O₄ (red) and SrTiO₃ (green) depending on whether the Fe₃O₄ structure is mirrored around the vertical axis. (c) SAD along the [−110] viewing direction for both SrTiO₃ and Fe₃O₄. (d) SAD along the [−110] viewing direction for SrTiO₃ and the [1−10] viewing direction for Fe₃O₄. The correspondence between (b,d) shows that the Fe₃O₄ is mirrored from direct cube on cube epitaxy.