Nonlinear Optical Imaging of Entangled Heterophase Polydomains in Ferroelectric BZT Films

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Electronic Materials Pub Date : 2025-07-10 DOI:10.1002/aelm.202500278

Piyali Maity, Hongbo Chen, Jun Ouyang, Yuhang Ren

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引用次数: 0

Abstract

Quantitative evaluation of multi‐phase evolution and domain characteristics in ferroelectric thin films is essential for understanding device engineering and underlying physical mechanisms. However, extracting local strain distribution and defects remains challenging with conventional techniques. Here, the azimuth‐ and polarization‐dependent second harmonic generation (SHG) approach for distinguishing the tetragonal and rhombohedral domain variants in ferroelectric BaZr0.2Ti0.8O3 (BZT) films is presented. It is demonstrated that strain from the LaAlO3 (LAO) substrates breaks the in‐plane symmetry of BZT thin films, significantly altering their second‐order nonlinear susceptibility. Variations in SHG intensity and susceptibility characterize and spatially map polymorphic nanodomains and internal elastic strain fields within the BZT/LAO heterostructure. It is shown that the competition between tetragonal and rhombohedral phases gives rise to anisotropic nanodomains with complex elastic and electric fields. The SHG imaging spectroscopy is well‐suited for understanding microstructural variations in ferroelectrics, which are directly relevant to device performance in memory and energy storage applications.

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铁电BZT薄膜中纠缠异相多畴的非线性光学成像

定量评价铁电薄膜的多相演化和畴特性对于理解器件工程和潜在的物理机制至关重要。然而，提取局部应变分布和缺陷仍然是传统技术的挑战。本文提出了一种区分铁电BaZr0.2Ti0.8O3 （BZT）薄膜中四边形和菱形畴变体的二次谐波产生（SHG）方法。结果表明，来自LaAlO3 （LAO）衬底的应变破坏了BZT薄膜的面内对称性，显著改变了其二阶非线性敏感性。SHG强度和磁化率的变化表征和空间映射了BZT/LAO异质结构中的多晶纳米畴和内部弹性应变场。结果表明，四方相和菱形相之间的竞争产生了具有复杂弹性和电场的各向异性纳米畴。SHG成像光谱非常适合于理解铁电体的微观结构变化，这与存储器和储能应用中的器件性能直接相关。

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来源期刊

Advanced Electronic Materials NANOSCIENCE & NANOTECHNOLOGYMATERIALS SCIE-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

11.00

自引率

3.20%

发文量

433

期刊介绍： Advanced Electronic Materials is an interdisciplinary forum for peer-reviewed, high-quality, high-impact research in the fields of materials science, physics, and engineering of electronic and magnetic materials. It includes research on physics and physical properties of electronic and magnetic materials, spintronics, electronics, device physics and engineering, micro- and nano-electromechanical systems, and organic electronics, in addition to fundamental research.