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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

2.8K
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...
2.8K
Valence Bond Theory02:42

Valence Bond Theory

10.3K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
10.3K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

5.5K
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...
5.5K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

11.0K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
11.0K
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

1.6K
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 permittivity....
1.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

29.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
29.2K

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関連する実験動画

Updated: Nov 25, 2025

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

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オーガニック・フェロエレクトリック・ヴォルテックス・アンチヴォルテックス・ドメイン構造

Yuan-Yuan Tang1, Yongfa Xie1, Yong Ai1

  • 1Ordered Matter Science Research Center, Nanchang University, Nanchang 330031, People's Republic of China.

Journal of the American Chemical Society
|December 16, 2020
PubMed
まとめ

研究者は,ReO4 ([4-F-Q]ReO4) を改変することによって,新しい有機フェロエレクトリック [4-フッ素キヌクリドニウム]を合成した. この材料は,強化された特性と安定した渦巻き対渦巻きトポロジカルデフェクトを示し,先進的なフェロ電気アプリケーションの道を開きます.

さらに関連する動画

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

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関連する実験動画

Last Updated: Nov 25, 2025

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
06:27

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Published on: July 2, 2018

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

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科学分野:

  • 材料科学
  • 固体物理学
  • 有機化学

背景:

  • オーガニック・フェロエレクトリックは 柔軟性や低インペダンスのような利点があります
  • 渦のようなトポロジカルな欠陥は,有機鉄電気システムでは十分に研究されていない.
  • 分子設計は 鉄電性の特性を調整する鍵です

研究 の 目的:

  • 有機電鉄を合成して 性能を向上させる
  • オーガニック・フェロエレクトリックの トポロジカル・デフェクトの形成と安定性を調査する.
  • フェロ電気的行動に対する分子変化の影響を 探求するためです

主な方法:

  • H/F置換を含む分子設計戦略
  • [4-フローロキヌクリドニウム]ReO4 ([4-F-Q]ReO4) の合成
  • 機械的ストレス下における鉄電性およびドメイン構造の特徴化

主要な成果:

  • [4-F-Q]ReO4を 合成しました
  • [Q]ReO4と比較して,より高いキュリー温度 (466 K) と自発的偏化 (11.37 μC/cm2) を達成した.
  • 安定した渦巻き対渦巻きのトポロジカル構成を持つ風車のようなドメインパターンを観測した.

結論:

  • H/F置換は,有機鉄電性の特性を高めるための効果的な戦略です.
  • [4-F-Q]ReO4は独特のドメインパターンと安定したトポロジック欠陥を示しています.
  • この研究は,有機鉄電学における新興現象の探求への道を開きます.