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Route to achieving perfect B-site ordering in double perovskite thin films

Josée E Kleibeuker, Eun-Mi Choi, Edward D Jones, Tse-Min Yu, Bianca Sala, Belinda A MacLaren, Demie Kepaptsoglou, David Hernandez-Maldonado, Quentin M Ramasse, Lewys Jones, Juri Barthel, Ian MacLaren and Judith L MacManus-Driscoll

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Figure 4.

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STEM of the structure and chemistry of La2CoMnO6 films on (111)-oriented LSAT and (111)-oriented SrTiO3: (a) high-angle annular dark field STEM image of 10nm2 of the substrate-film interface for the La2CoMnO6 film on LSAT, with the approximate interface position delineated, the partial Al-Ta ordering in the LSAT is easily seen; (b) superimposed EELS maps of Mn (green) and Co (blue) showing a high degree of ordering for the La2CoMnO6 film on LSAT; (c) detailed EEL spectrum around the Mn-L2,3 edge for the bulk of the La2CoMnO6 film on LSAT compared to standards; (d) detailed EEL spectrum around the Co-L2,3 edge from the same area as (c) compared to standards; (e) low-angle annular dark field-STEM image of 10nm2 of La2CoMnO6 on SrTiO3, with the approximate interface position delineated; (f) superimposed Mn (green) and Co (blue) EELS maps of an area within the centre of the film on SrTiO3 showing some columns richer in one element, but no clear evidence of long-range Co-Mn ordering; (g) detailed EEL spectrum around the Mn-L2,3 edge for the bulk of the La2CoMnO6 film on SrTiO3 compared to standards; (h) detailed EEL spectrum around the Co-L2,3 edge from the same area as (g) compared to standards.

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