Untilting BiFeO3: The influence of substrate boundary conditions in ultra-thin BiFeO3 on SrTiO3
Source abstract
Abstract
We report on the role of oxygen octahedral tilting in the monoclinic-to-tetragonal phase transition in ultra-thin BiFeO3 films grown on (001) SrTiO3 substrates. Reciprocal space maps clearly show the disappearance of the integer-order Bragg peak splitting associated with the monoclinic phase when the film thickness decreases below 20 unit cells. This monoclinic-to-tetragonal transition is accompanied by the evolution of the half-order diffraction peaks, which reflects untilting of the oxygen octahedra around the [110] axis, proving that the octahedral tilting is closely correlated with the transition. This structural change is thickness-dependent, and different from a strain-induced transition in the conventional sense.
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Research context
OpenAlex topics: Multiferroics and related materials · Ferroelectric and Piezoelectric Materials · Seismic Waves and Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of Michigan 1 Department of Physics, , Ann Arbor, Michigan 48109, USA
Argonne National Laboratory 2 X-ray Science Division, Advanced Photon Source, , Argonne, Illinois 60439, USA
Cornell University 3 Department of Materials Science and Engineering, , Ithaca, New York 14853, USA
Stanford University 4 Department of Applied Physics, , Stanford, California 94305, USA
Cornell University 5 Kavli Institute at Cornell for Nanoscale Science, , Ithaca, New York 14853, USA
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