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関連する概念動画

Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
5.0K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

958
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

3.6K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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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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関連する実験動画

Updated: Sep 9, 2025

Scanning SQUID Study of Vortex Manipulation by Local Contact
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単分子交差点における弾道環電流から発生する実質的な磁場

William Bro-Jørgensen1,2, Stephan P A Sauer1, Gemma C Solomon1,2,3

  • 1Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.

JACS Au
|August 29, 2025
PubMed
まとめ

研究者は単一分子の交差点から磁場を計算しました 高い電流と小さなリング直径のような 特定の分子構造と条件が 実験的に重要な磁場を生成するための 鍵であると発見しました

キーワード:
バイオット・サバルト法則電流密度マグネティズム分子電子リング電流単分子電磁気単一分子結合

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関連する実験動画

Last Updated: Sep 9, 2025

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科学分野:

  • 分子電子
  • 量子化学について
  • スピントロニクス

背景:

  • 単一分子交差点への電気バイアスは トンネリング経由で電流を発生させます
  • 周期的または螺旋的な構造を持つ分子は,磁場を生成する円形の電流を示します.

研究 の 目的:

  • 単分子結合で弾道電流の密度によって生成される磁場を計算する.
  • 大量の電流誘発磁場を誘導する分子構造と条件を特定する.

主な方法:

  • バイオ・サバルト法を実装する
  • 選択された周期的および線形分子における電流密度から磁場を計算する.
  • 電流,リングの単方向性,直径を含む磁場強度に影響を与える要因の分析.

主要な成果:

  • 大量の磁場には3つの前提条件があります. 高電流,バイアスウィンドウ内の片方向のリング電流,小さなリング直径です.
  • 結合長が交互に変化するサイクルアンヌレンは,mT範囲の磁場を生成する.
  • 螺旋型のπシステムを持つ線形炭素鎖は,潜在的に共鳴に近いサブテスラレベルに達するmT範囲のフィールドを生成します.

結論:

  • 低バイアスの分子ワイヤで実験的に関連する電流誘導磁場を生成するための概念証明.
  • 有意な磁場を生成するための有望な候補として特定された周期的および線形分子.