We report the structural and optical properties of nanoscale Sr₂IrO₄ freestanding thin films fabricated using a water-soluble Sr₃Al₂O₆ layer. The coherent lattice structure, phonon modes, two-magnon Raman scattering, and optical absorption spectra of the Sr₂IrO₄ nanomembrane are analogous to those of the layered iridate epitaxial thin films and single crystals. Remarkably, the formation of 3-unit-cell-thick SrIrO₃ and interfacial composite layers alleviates the antiphase boundaries at the Sr₂IrO₄/Sr₃Al₂O₆ interface, resulting in structurally robust nanomembranes. Our experimental results show that this freestanding thin-film approach of layered oxides can provide techniques for tuning or realizing unprecedented states beyond conventional thin-film methods, suggesting a pathway in achieving flexible layered-oxide electronics.

中文翻译：

---

用于柔性电子的纳米级Sr ₂ IrO ₄独立膜

我们报告了使用水溶性Sr ₃ Al ₂ O ₆层制造的纳米级Sr ₂ IrO ₄独立式薄膜的结构和光学性质。Sr ₂ IrO ₄纳米膜的相干晶格结构，声子模，两磁子拉曼散射和光吸收光谱类似于层状铱酸盐外延薄膜和单晶。值得注意的是，形成3单元厚度的SrIrO ₃和界面复合层可减轻Sr ₂ IrO ₄ / Sr ₃ Al ₂ O ₆的反相边界。界面，导致结构坚固的纳米膜。我们的实验结果表明，这种独立的分层氧化物薄膜方法可以提供用于调节或实现超越常规薄膜方法的前所未有的状态的技术，这为实现柔性的分层氧化物电子学提供了一条途径。