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Ultrafast Optically Induced Perturbation of Oxygen Octahedral Rotations in Multiferroic BiFeO 3 Thin Films.

Authors :
Li N
Lee HJ
Sri Gyan D
Ahn Y
Landahl EC
Carnis J
Lee JY
Kim TY
Unithrattil S
Jo JY
Chun SH
Kim S
Park SY
Eom I
Adamo C
Li SJ
Kaaret JZ
Schlom DG
Wen H
Benedek NA
Evans PG
Source :
Nano letters [Nano Lett] 2024 May 29; Vol. 24 (21), pp. 6417-6424. Date of Electronic Publication: 2024 May 06.
Publication Year :
2024

Abstract

The functional properties of complex oxides, including magnetism and ferroelectricity, are closely linked to subtle structural distortions. Ultrafast optical excitations provide the means to manipulate structural features and ultimately to affect the functional properties of complex oxides with picosecond-scale precision. We report that the lattice expansion of multiferroic BiFeO <subscript>3</subscript> following above-bandgap optical excitation leads to distortion of the oxygen octahedral rotation (OOR) pattern. The continuous coupling between OOR and strain was probed using time-resolved X-ray free-electron laser diffraction with femtosecond time resolution. Density functional theory calculations predict a relationship between the OOR and the elastic strain consistent with the experiment, demonstrating a route to employing this approach in a wider range of systems. Ultrafast control of the functional properties of BiFeO <subscript>3</subscript> thin films is enabled by this approach because the OOR phenomena are related to ferroelectricity, and via the Fe-O-Fe bond angles, the superexchange interaction between Fe atoms.

Details

Language :
English
ISSN :
1530-6992
Volume :
24
Issue :
21
Database :
MEDLINE
Journal :
Nano letters
Publication Type :
Academic Journal
Accession number :
38710072
Full Text :
https://doi.org/10.1021/acs.nanolett.4c01519