高频电场诱导的极化反应在酸铁薄膜中的高频电场
Anoop Kumar Kushwaha1,2, Rajan Khadka2, Pawel Keblinski2
1Center for Materials, Devices, and Integrated Systems (cMDIS), Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
ACS applied materials & interfaces
|August 6, 2025
概括
酸铁 (BaTiO3) 纳米膜中的极化方向对它们的电响应产生了重大影响. 在平面外的极化导致准电行为,而在平面内的极化保持了跨频率的铁电性质.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 乙酸 (BaTiO3) 是一种重要的铁电材料,在电子设备中具有应用.
- 了解超薄BaTiO3膜的行为对于下一代电子设备至关重要.
- 铁电薄膜中的极化方向可以显著改变它们的特性.
研究的目的:
- 为了研究 BaTiO3 纳米膜的依赖频率的极化电场 (P-E) 反应.
- 为了比较P-E响应在平面内与平面外的电场方向.
- 为了阐明极化方向对BaTiO3纳米膜中铁电切换动态的影响.
主要方法:
- 用分子动力学模拟来建模PE反应.
- 模拟覆盖了从大约10GHz到1000GHz的广泛频率范围.
- 对于BaTiO3纳米膜,模拟了在平面内和平面外的电场方向.
主要成果:
- 外平面极化BaTiO3薄膜呈现微不足道的歇斯底里,由于去极化场,在低频率 (∼10 GHz) 处表现得像电体.
- 在平面内极化BaTiO3薄膜,薄度为≤10nm,显示频率依赖的铁电特性.
- 在低频率 (10-200 GHz) 中观察到正方形铁电环,在高频率 (500-1000 GHz) 中转变为圆形状,残余极化减少.
结论:
- BaTiO3纳米膜中的极化方向深刻地影响了它们的依赖频率的切换行为.
- 外平面偏振抑制铁电,而内平面偏振保留它,类似于散装BaTiO3.
- 这些发现为设计用于各种频率应用的超薄铁电材料提供了途径.
更多相关视频
09:41Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
9.6K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
7.7K
相关概念视频
Dielectric Polarization in a Capacitor
5.0K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.0K
Potential Due to a Polarized Object
472
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
472
Electrostatic Boundary Conditions in Dielectrics
1.4K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.4K
