期刊
NANO LETTERS
卷 20, 期 8, 页码 6045-6050出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02063
关键词
BiFeO3; multiferroic; thin films; strain engineering; spin-charge-lattice coupling
类别
资金
- EPSRC (U.K.) [EP/M022706/1, EP/P031544/1, EP/P025803/1]
- Royal Society
- EPSRC [EP/N010825/1, EP/P031544/1, EP/M022706/1, EP/P025803/1] Funding Source: UKRI
Ferroelectric-paraelectric superlattices show emerging new states, such as polar vortices, through the interplay and different energy scales of various thermodynamic constraints. By introducing magnetic coupling at BiFeO3-La0.7Sr0.3MnO3 interfaces epitaxially grown on SrTiO3 substrate, we find, for the first time in thin films, a sub-nanometer thick lamella-like BiFeO3. The emergent phase is characterized by an arrangement of a two unit cell thick lamella-like structure featuring antiparallel polarization, resulting an antiferroelectric-like structure typically associated with a morphotropic phase transition. The antipolar phase is embedded within a nominal R3c structure and is independent of the BiFeO3 thickness (4-30 unit cells). Moreover, the superlattice structure with the morphotropic phase demonstrates azimuth-independent second harmonic generation responses, indicating a change of overall symmetry mediated by a delicate spatial distribution of the emergent phase. This work enriches the understanding of a metastable state manipulated by thermodynamic constraints by lattice strain and magnetic coupling.
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