Journal
JOURNAL OF MATERIALS RESEARCH
Volume 32, Issue 12, Pages 2423-2430Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2017.206
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Funding
- National Natural Science Foundation of China [51231007, 51571197, 51501194, 51671194, 51521091]
- National Basic Research Program of China [2014CB921002]
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-JSC010]
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Structural distortions at the nanoscale are delicately linked with many exotic properties for ferroic thin films. Based on advanced aberration corrected scanning transmission electron microscopy, we observe BiFeO3 thin films with variant tensile strain states and demonstrate at an atomic scale the interplay of intrinsic spontaneous structural distortions with external constraints. Structural parameters (the rhombohedral distortion and domain wall shear distortion) under zero (BiFeO3/GdScO3) and 1.5% (BiFeO3/PrScO3) lateral strain states are quantitatively analyzed which are suppressed within a few unit cells near the film/substrate interfaces. In particular, an interfacial layer with asymmetrical lattice distortions (enhanced and reduced out-of-plane lattice spacing) on the two sides of 109 degrees domain wall is resolved. These structural distortions near the film/substrate interface in ferroic thin films reveal intense tanglement of intrinsic distortions of BiFeO3 with external boundary conditions, which could provide new insights for the development of nanoscale ferroelectric devices.
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