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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

3.6K
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...
3.6K
Types Of Superconductors01:28

Types Of Superconductors

1.9K
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...
1.9K
Colors and Magnetism03:02

Colors and Magnetism

14.9K
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...
14.9K
Diamagnetism01:26

Diamagnetism

3.6K
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....
3.6K
Paramagnetism01:30

Paramagnetism

3.3K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.3K
Valence Bond Theory02:42

Valence Bond Theory

11.9K
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...
11.9K

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Updated: Apr 21, 2026

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

8.7K

超原子固体におけるフェロ磁気順序付け

Chul-Ho Lee1, Lian Liu, Christopher Bejger

  • 1Department of Chemistry, Columbia University , New York, New York 10027, United States.

Journal of the American Chemical Society
|November 8, 2014
PubMed
まとめ
この要約は機械生成です。

研究者らは,分子クラスターから固体物質を組み立てることで,予測可能な磁気特性が生まれることを示しています. これらの超原子的な構成要素を修正することで,集合的な鉄磁気行動の制御された変化が可能になります.

さらに関連する動画

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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

Published on: June 7, 2018

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関連する実験動画

Last Updated: Apr 21, 2026

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

8.7K
Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
12:20

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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

Published on: June 7, 2018

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科学分野:

  • 材料科学 材料科学とは
  • 固体化学 固体化学
  • ナノテクノロジー ナノテクノロジー

背景:

  • 分子クラスターからの固体物質の組み立ては,新しい特性の可能性を提供します.
  • 利益を実現するための重要な基準には,再現可能な合成,新興特性,予測可能な構造-特性関係が含まれます.

研究 の 目的:

  • 予測可能な新興特性を持つクラスター組成の固体を作り出すことの実現可能性を実証する.
  • 分子ニッケルテルリウリドクラスターとフルレレンから組み立てられた固体の磁気行動を調査するために.
  • 超原子の構成要素を改変することで,集合磁気性質の予測可能な変化が生じることを示すため.

主な方法:

  • マグネトメトリとミューオン・スピン・リラクゼーション測定を用いた.
  • 超原子固体の結晶学的定義が用いられている.
  • 分子ニッケルテルリウリドクラスターとフルレレンから合成された純粋な物質のマクロスコープ量.

主要な成果:

  • 低温でクラスター組成の固体における鉄磁気相変遷を実証した.
  • 観測された性質は,構成要素のサブユニットの単純な平均ではなく,エマージェントであることを確認しました.
  • 超原子の合理的な改変が,協同磁性特性の予測可能な変化をもたらすことを示した.

結論:

  • クラスターで組み立てられた固体材料から重大な利益を実現するための基準を満たした.
  • 超原子工学を通じて調節可能な磁気特性を有する材料の設計のためのプラットフォームを確立しました.
  • 分子構成要素に基づいた高度な機能的材料の開発への道を開いた.