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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

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...
Paramagnetism01:30

Paramagnetism

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...
Diamagnetism01:26

Diamagnetism

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.
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...

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関連する実験動画

Updated: Jul 12, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
08:25

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

室温の分子/有機ベースの磁石

J M Manriquez, G T Yee, R S McLean

    Science (New York, N.Y.)
    |June 7, 1991
    PubMed
    まとめ

    新しいヴァナジウム-テトラシアノエチレン化合物は,室温の磁気ヒステレスを示しています. このフェリ磁性物質は,

    科学分野:

    • マテリアルサイエンス 材料科学
    • マグネチズム (磁気) とは
    • 無機化学 無機化学とは

    背景:

    • ビス (ベンゼン) ヴァナジウム (bis (benzene) vanadium) は,知られている有機金属化合物である.
    • テトラシアノエチレン (TCNE) は強い電子受容体である.
    • 有機金属化合物は,興味深い磁気特性を示すことができます.

    研究 の 目的:

    • ビス・ベンゼン・ヴァナジウムとTCNEから新しい磁気材料を合成し,特徴づけること.
    • 磁化とヒステレシスを含む,結果として得られる固体の磁性特性を調査する.
    • 新しい化合物の組成と磁気結合機構を決定する.

    主な方法:

    • ビス (((ベンゼン)) バナジウムとテトラシアノエチレンの反応.
    • 磁気感受性の測定. 磁気感受性の測定. 磁気感受性の測定. 磁気感受性の測定.
    • 赤外線スペクトロスコーピー. 赤外線スペクトロスコーピー. 赤外線スペクトロスコーピー. 赤外線スペクトロスコーピー.

    主要な成果:

    • 経験的組成 V(TCNE) x.Y(CH(2) Cl(2)) (x≈2, Y≈1/2) の不溶性無形黒い固体を合成した.
    • この材料は,室温でフィールド依存磁化とヒステレシスを示しています.

    さらに関連する動画

    Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K
    06:45

    Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K

    Published on: January 11, 2019

    Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
    06:53

    Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

    Published on: June 9, 2023

    関連する実験動画

    Last Updated: Jul 12, 2026

    Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
    08:25

    Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

    Published on: July 3, 2015

    Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K
    06:45

    Use of Electron Paramagnetic Resonance in Biological Samples at Ambient Temperature and 77 K

    Published on: January 11, 2019

    Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
    06:53

    Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

    Published on: June 9, 2023

  • 臨界温度は350Kを超え,サンプルの分解点となる.

    • 結論:

    • 合成されたヴァナジウム-TCNE素材は,フェリ磁気的振る舞いを示しています.
    • 磁気結合メカニズムとして,ドナーと受容子のスピン間の3次元の反鉄磁気交換が提案されています.
    • この材料の高い臨界温度から,磁気装置における潜在的な応用が示唆される.