Figure 6

STEM imaging and electron energy loss spectroscopy spectrum imaging of non-stoichiometry at the substrate-film interface: (a) high-angle annular dark field-STEM image of Co-rich particles at the interface of La₂CoMnO₆ on SrTiO₃; (b) atomic resolution high-angle annular dark-field-STEM image of the atomic structure of a particle in the La₂CoMnO₆ film on LSAT; (c) superimposed Co-Mn EELS map of the particle in b, where Co is blue and Mn is green; (d) superimposed Co-Mn EELS map, where Co is blue and Mn is green, of an interface area on LSAT that was free of Co-rich particles. The yellow dotted line indicates the interface between LSAT and La₂CoMnO₆.