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Title: Strain localization in thin films of Bi(Fe,Mn)O 3 due to the formation of stepped Mn 4+-rich antiphase boundaries

Here, the atomic structure and chemistry of thin films of Bi(Fe,Mn)O 3 (BFMO) films with a target composition of Bi 2FeMnO 6 on SrTiO 3 are studied using scanning transmission electron microscopy imaging and electron energy loss spectroscopy. It is shown that Mn4+-rich antiphase boundaries are locally nucleated right at the film substrate and then form stepped structures that are approximately pyramidal in three dimensions. These have the effect of confining the material below the pyramids in a highly strained state with an out-of-plane lattice parameter close to 4.1 Å. Outside the area enclosed by the antiphase boundaries, the out-of-plane lattice parameter is much closer to bulk values for BFMO. This suggests that to improve the crystallographic perfection of the films whilst retaining the strain state through as much of the film as possible, ways need to be found to prevent nucleation of the antiphase boundaries. Since the antiphase boundaries seem to form from the interaction of Mn with the Ti in the substrate, one route to perform this would be to grow a thin buffer layer of pure BiFeO 3 on the SrTiO 3 substrate to minimise any Mn-Ti interactions.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5]
  1. Univ. of Glasgow, Glasgow (United Kingdom)
  2. STFC Daresbury Labs., Warrington (United Kingdom); Univ. of Oxford, Oxford (United Kingdom); Univ. of Vienna, Vienna (Austria)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Electronic Science and Technology of China, Chengdu (China)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Cambridge, Cambridge (United Kingdom)
Publication Date:
Report Number(s):
LA-UR-15-23680
Journal ID: ISSN 1931-7573
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nanoscale Research Letters
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 1931-7573
Publisher:
Springer
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; material science; thin films; interfaces; magnetic; bismuth ferrite; scanning transmission electron microscopy (STEM); strain; multiferroic; antiphase boundaries
OSTI Identifier:
1329687