铁电单子在表轴木铁超级网中制作的铁电单子
Vivasha Govinden1, Peiran Tong2, Xiangwei Guo3,4,5
1School of Materials Science and Engineering, University of New South Wales Sydney, Kensington, NSW, Australia.
Nature communications
|July 13, 2023
概括
研究人员在多铁超中发现了铁电单子,粒子状的极化纹理. 这些发现预先为下一代电子设备和拓电子学提供了材料.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 铁电材料表现出复杂的相互作用,导致拓保护的极化纹理,称为铁电单子.
- 这些单子由于其纳米尺寸和响应能力,对超越CMOS技术具有前景.
- 在multiferroics中展示这样的纹理仍然很少见.
研究的目的:
- 为了调查和提出证据,在 (BiFeO3) / ((SrTiO3) 超格子中的铁电单子.
- 为了描述这些单体的拓和大小.
- 探索拓电荷及其对多铁系系统的影响.
主要方法:
- 高分辨率的压响应力显微镜 (PFM).
- 经过Cs校正的高角度环状暗场扫描传输电子显微镜 (HAADF-STEM).
- 极化位移的映射. 极化位移的映射. 极化位移的映射.
- 阶段场模拟.阶段场模拟.
- 基于第一原则的有效的哈密尔顿计算.
主要成果:
- 在 (BiFeO3) / ((SrTiO3) 超级中发现了铁电单子的证据.
- 观察到各种各样的单离子拓,包括中心-收/分离缺陷,最小为3nm.
- 阶段场模拟确定了一些结构为双重体,其拓电荷为±1.1.
- 有效的哈密尔顿计算揭示了非整数拓电荷,这是基于BiFeO3的系统中的新观察.
结论:
- 这项研究证实了多铁 (BiFeO3) / ((SrTiO3) 超级网格中铁电单子的存在.
- 观察到的拓缺陷和电荷为多铁体的行为提供了新的见解.
- 这些发现为多铁子拓学的进步开辟了道路.
相关概念视频
Types Of Superconductors
1.0K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.0K
Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Molecular and Ionic Solids
17.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.3K
Electrostatic Boundary Conditions in Dielectrics
1.3K
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...
1.3K
Fermi Level Dynamics
285
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
285


