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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

2.5K
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...
2.5K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

18.3K
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...
18.3K
Colors and Magnetism03:02

Colors and Magnetism

12.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.2K
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...
28.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.5K
Valence Bond Theory02:42

Valence Bond Theory

9.8K
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...
9.8K

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関連する実験動画

Updated: Oct 4, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

8.2K

鉄電性インコメンスラートスピン結晶

Dorin Rusu1, Jonathan J P Peters1,2, Thomas P A Hase1

  • 1Department of Physics, University of Warwick, Coventry, UK.

Nature
|February 10, 2022
PubMed
まとめ

研究者らは鉛のチタナート層に新しい鉄電渦を観測し,不均衡の極性結晶を生み出しました. この発見は,磁性スピン結晶の電気アナログを提供し,鉄電気と鉄磁性トポロジーの間の線を模糊させます.

さらに関連する動画

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

8.9K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.6K

関連する実験動画

Last Updated: Oct 4, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

8.2K
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.6K

科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 鉄電と鉄磁気

背景:

  • フェロアイク,特にフェロマグネットは,特定の条件下で渦やスキルミオンのような複雑なトポロジカルスピン構造を示します.
  • PbTiO3/SrTiO3の超格子のようなフェロ電気システムは,渦のような電気二極構造を示している.
  • Dzyaloshinskii-Moriya相互作用によって駆動される磁気スピン格子に相当する電気二極は,実験的に実現されていません.

研究 の 目的:

  • SrRuO3電極の間に挟まれた単一のPbTiO3表軸層のドメイン構造を調査する.
  • 新しい鉄電気的トポロジカル構造を実験的に観察し,特徴づけること.
  • 磁気Dzyaloshinskii-Moriya相互作用駆動のフェロ電気アナログを探求する.

主な方法:

  • SrRuO3電極による単一のPbTiO3表軸層の実験試験
  • 周期的な鉄電渦の観測
  • 観測されたトポロジーを支持する理論的計算.

主要な成果:

  • 時針の方向と逆の方向の周期的な鉄電渦の観測.
  • 渦の核に沿った二次秩序の発見, 迷宮のようなパターンを生み出す.
  • 2つの正交周期変調を持つ不均衡の極性結晶の形成
  • 観測された構造は,フェロマグネットの不均衡なスピン結晶のフェロ電気アナログとして機能する.

結論:

  • この研究は,磁気スピン結晶に類似した,フェロ電気 PbTiO3 の新しい不均衡の極性結晶を明らかにした.
  • これらの発見は,新興の鉄磁気と鉄電気的トポロジーの区別を曖昧にしています.
  • 結果は,磁気Dzyaloshinskii-Moriya相互作用駆動の相の電気対称性を実現するための道を開く.