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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

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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...
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Diamagnetism01:26

Diamagnetism

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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....
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Paramagnetism01:30

Paramagnetism

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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...
2.6K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Magnetism01:30

Magnetism

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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...
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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MnBi2は永久磁石である

Catherine K Badding1, Eric A Riesel1, Ryan A Murphy1

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|July 15, 2025
PubMed
まとめ
この要約は機械生成です。

研究者らは,高圧とシンクロトロンX線磁気円形二極化を用いて,新しい化合物であるMnBi2の磁気特性を研究した. ビスムスの軌道角運動量とスピン軌道結合が磁気アニソトロピーを与え,新しい永久磁石のための高Z要素を検証した.

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • マグネティズム

背景:

  • 軌道 Momentum angular (momentum angular) の影響 (impact) を理解することは,新しい永久磁石の開発に不可欠である.
  • 高い原子番号 (Z) の元素は,磁性特性の重要な要因であるスピン軌道結合を強化します.
  • 永久磁石MnBiを含むMn-Biシステムは,これらの関係を研究するための有望なプラットフォームです.

研究 の 目的:

  • 高圧下でのMnBi2化合物の磁気特性を調査する.
  • MnBi2の磁気における軌道角運動量とスピン軌道結合の役割を明らかにする.
  • 新しい硬い永久磁石の設計における高Z元素の潜在能力を探求する.

主な方法:

  • シンクロトロンX線磁気円二極化 (XMCD) が磁気探査に使用された.
  • 実験は高圧でダイヤのを使って行われました.
  • 最初の原則の計算は実験データと組み合わせて使用された.

主要な成果:

  • MnBi2は10Kと室温の両方で鉄磁気ヒステレスを示します.
  • Bi原子から発生する軌道 Momentum angularとスピン-orbit couplingは,磁気アニソトロピーを誘導することが示された.
  • Bi p と d 軌道の分析は,Mn-Bi システム内の磁気行動の変化を説明した.

結論:

  • この研究は,高Z元素,特にビスムスが,磁性アニソトロピーの伝達において重要な役割を果たしていることを確認しています.
  • この発見は,高度な永久磁石の合成に高Z元素を使用する戦略を支持する.
  • MnBi2は,高圧磁気現象のさらなる調査のための有効な材料です.