铁电K0.5Na0.5NbO3薄膜中的流闭域结构
Meng-Jun Zhou1,2, Zhi-Wei Hao1,2, Yu-Long Zhang1,2
1State Key Laboratory of Advanced Glass Materials, Wuhan University of Technology, Wuhan 430070, China.
研究人员在酸 (KNN) 薄膜中探索了拓域结构. 他们确定了三种流量关闭配置及其切换行为, 为新型电子设备提供了洞察力.
科学领域:
- 凝聚物质物理学
- 材料科学
- 计算材料科学
背景情况:
- 铁电领域的拓结构对于先进的应用至关重要.
- 在低对称的铁电中,理解这些结构,如正方形相,仍然有限.
- 目前的研究主要集中在四面体和圆面体铁电氧化物上.
研究的目的:
- 理论上预测和分析K0.5Na0.5NbO3 (KNN) 薄膜中的拓流闭域结构.
- 调查有限的尺寸,不合适的应变以及电气边界条件对这些结构的影响.
- 展示这些拓配置的切换能力和相位过渡行为.
主要方法:
- 使用相场模拟来建模铁电K0.5Na0.5NbO3 (KNN) 薄膜.
- 在平面内 (I型),平面外 (II型) 和超域 (III型) 的静态结构和动态行为.
- 分析了形成机制的能量前景,并模拟了用于切换的极化电场歇斯底里循环.
主要成果:
- 在KNN薄膜中确定了三种流闭域结构 (I,II,III类).
- 观察到的尺寸缩小或小的不合适应变可能导致I型结构的极旋转.
- 在开放电路条件下在域壁交叉点形成II型结构.
- 证明了II型和III型结构的切换能力.
- 揭示了电场诱导的可逆的正方形-形相位过渡, 保持了流体封闭的完整性.
结论:
- 提供对低对称铁电结构的理论见解.
- 提供用于识别和操纵流闭域的实用指南.
- 为开发利用拓结构的节能微电子设备铺平了道路.
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