Analysis of interfacial structure and chemistry in FeV2O4-based heterostructures on (001)-oriented SrTiO3

In this study, we investigate the interfacial structures and chemistry of FeV2O4 (FVO)/ SrTiO3 (STO) and FeV2O4/La0.33Sr0.67MnO3/SrTiO3 (FVO/LSMO/STO) heterostructures, in which FVO is epitaxially grown on both a (001)-oriented SrTiO3 substrate and a LSMO-buffered substrate by pulsed laser deposition (PLD). By combining data from transmission electron microscopy (TEM) imaging together with high-resolution scanning transmission electron microscopy (STEM) imaging, the interfaces between FVO and STO, and FVO and LSMO are found to be coherent and semicoherent, respectively, in spite of more than 8% of strain at the interface. Energy-dispersive X-ray spectroscopy (EDS) analysis suggests that localised diffusion occurs at both the FVO/STO and the FVO/LSMO interfaces.