Atomical-Rippled-Nanodomains Stabilized Large Polarization in BiSmCo<sub>2</sub>O<sub>6</sub> Double-Perovskite Films.
basic_science · Level V
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- Record sourced from PubMed, PMID 40873043.
- Also identified by DOI 10.1002/adma.202509635.
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Abstract
Double-perovskite ferroelectrics have attracted increasing attention due to their highly tunable structures, multifunctional coupling effects, and potential applications in next-generation nonvolatile ferroelectric semiconductor devices. Here, an atomical-rippled-nanodomains (ARNs) are introduced to BiCoO<sub>3</sub> and SmCoO<sub>3</sub> solid solution double-perovskite film due to its ferroelectric single-domain coupling. By engineering triaxial tensile strain, the ferroelectric ARNs are robustly formed in BiSmCo<sub>2</sub>O<sub>6</sub> double-perovskite films, leading to a large ferroelectric polarization (≈23.1 µC cm<sup>-2</sup>) and ultra-enduring ferroelectric fatigue resistance exceeding 10<sup>12</sup> cycles without degradation. These results represent a significant enhancement in the performance boundaries of orthorhombic type-II multiferroics. The ferroelectric switching dynamics reveal the intrinsic correlation between the continuous switchable ARNs and the outstanding ferroelectric behavior. These findings underscore the effectiveness of nanodomain-coupling strategy for realizing high-performance ferroelectrics and offer a promising pathway toward designing correlated oxide-based ferroelectric semiconductor devices with exotic functionalities.