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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Colors and Magnetism03:02

Colors and Magnetism

12.1K
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...
12.1K
Diamagnetism01:26

Diamagnetism

2.8K
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....
2.8K
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
Paramagnetism01:30

Paramagnetism

2.4K
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...
2.4K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

2.0K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
2.0K

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関連する実験動画

Updated: May 5, 2026

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

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 6, 2013

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フェロ磁気は,一次元単原子金属鎖におけるフェロ磁気である.

P Gambardella1, A Dallmeyer, K Maiti

  • 1Institut de Physique des Nanostructures, EPF-Lausanne, CH-1015 Lausanne, Switzerland. pietro.gambardella@epfl.ch

Nature
|March 22, 2002
PubMed
まとめ

研究者らはプラチナの1次元のコバルト鎖にフェロ磁気的秩序を発見した. アニゾトロピーバリアは,これらのナノスケール構造の長距離磁気オーダーリングを可能にし,以前の理論に挑戦します.

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー

背景:

  • 磁気システム (例えば,超薄膜,超格子) の縮小された次元性は,散発材料と比較して異なる性質をもたらす.
  • 理論的なモデルは,1次元 (1D) の磁気系には,熱の変動により,長距離の鉄磁気秩序が欠けていると予測しています.
  • 現存するモデルでは,ナノ構造の行動に不可欠な動的障壁と基板相互作用がしばしば無視されている.

研究 の 目的:

  • 一次元の単原子連鎖における磁的秩序を調査する.
  • 1Dナノ構造で長距離の鉄磁気秩序を達成する可能性を調査する.
  • 1D磁気における基板相互作用と運動障壁の役割を理解する.

主な方法:

  • コバルト (Co) の一次元単原子鎖をプラチナ (Pt) の基板の上に製造する.
  • 局所的軌道瞬間と磁性アニソトロピーを含む磁性特性の実験的特徴付け.
  • オーダーングトランジションを特定するために,温度に依存する磁気行動の分析.

主要な成果:

  • Pt.上の1D Co鎖における短距離と長距離の2つのフェロマグネティック・オーダーの存在を証明した.
  • 鎖は熱的に変動する鉄磁気セグメントで構成されていることが観察されました.

さらに関連する動画

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

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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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関連する実験動画

Last Updated: May 5, 2026

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

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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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  • 臨界温度以下での長距離鉄磁気秩序を達成するための鍵となるアニソトロピーの障壁を特定した.
  • 大きな局所的な軌道モーメントと磁気アニソトロピーのエネルギーを持つ Co チェーンを特徴とする.

    • 結論:

    • 一次元の単原子鎖は,いくつかの理論的予測に反して,長距離の鉄磁気秩序を示すことができる.
    • サブストラット相互作用とアニソトロピーの障壁は,1Dナノ構造における磁性オーダーリングを可能にする重要な要因である.
    • これらの発見は,原子スケールでの磁気材料の設計のための新しい道を開く.