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Untangling Electrostatic and Strain Effects on the Polarization of Ferroelectric Superlattices
Author(s) -
Khestanova Ekaterina,
Dix Nico,
Fina Ignasi,
Scigaj Mateusz,
Rebled José Manuel,
Magén César,
Estradé Sonia,
Peiró Francesca,
Herranz Gervasi,
Fontcuberta Josep,
Sánchez Florencio
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201602084
Subject(s) - superlattice , ferroelectricity , materials science , condensed matter physics , polarization (electrochemistry) , dielectric , lattice (music) , optoelectronics , physics , chemistry , acoustics
The polarization of ferroelectric superlattices is determined by both electrical boundary conditions at the ferroelectric/paraelectric interfaces and lattice strain. The combined influence of both factors offers new opportunities to tune ferroelectricity. However, the experimental investigation of their individual impact has been elusive because of their complex interplay. Here, a simple growth strategy has permitted to disentangle both contributions by an independent control of strain in symmetric superlattices. It is found that fully strained short‐period superlattices display a large polarization whereas a pronounced reduction is observed for longer multilayer periods. This observation indicates that the electrostatic boundary mainly governs the ferroelectric properties of the multilayers whereas the effects of strain are relatively minor.