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Ferromagnetism01:31

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
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.0K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.0K
The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

42.6K
Effect of Lone Pairs of Electrons on Molecule Geometry
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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一个单元石单层中的二维铁电

Jian Gou1, Hua Bai2,3, Xuanlin Zhang2

  • 1Department of Physics, National University of Singapore, Singapore, Singapore. phygouj@nus.edu.sg.

Nature
|April 5, 2023
PubMed
概括

研究人员在石层中发现了一种新奇的单元素铁电材料. 这种突破利用了有序的电荷转移和原子扭曲, 实现了可切换的电极化,

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科学领域:

  • 凝聚物质物理学
  • 材料科学
  • 纳米技术

背景情况:

  • 铁电材料表现出可切换的电极化,因为反向对称性被打破.
  • 传统的铁电器至少需要两个组成离子来进行偏振切换.

研究的目的:

  • 报告一个单元铁电状态的观察.
  • 为了研究石单层中铁电的机制.

主要方法:

  • 对石的电子结构和轨道杂交的理论研究.
  • 使用扫描探针显微镜进行铁电切换的实验可视化.

主要成果:

  • 一个类似黑的单层表现出单元素铁电性.
  • 电荷转移和原子扭曲导致逆向对称性被破坏的结构.
  • 在实验中证实了平面电极化和铁电切换.

结论:

  • 单元铁电扩大了对铁电机制的理解.
  • 这一发现可能会在未来的铁电子设备中带来新的应用.