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関連する概念動画

Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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.
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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...
Magnetic Force01:18

Magnetic Force

In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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関連する実験動画

Updated: Jun 30, 2026

Quantifying Mixing using Magnetic Resonance Imaging
07:33

Quantifying Mixing using Magnetic Resonance Imaging

Published on: January 25, 2012

2次元の電子系における量子ホール・フェロマグネティズム

Eom1, Cho, Kang

  • 1James Franck Institute and Department of Physics, University of Chicago, Chicago, IL 60637, USA. Department of Electrical Engineering, University of California at Santa Barbara, Santa Barbara, CA 93106, USA. Walter Schottky Instit.

Science (New York, N.Y.)
|September 29, 2000
PubMed
まとめ

実験により,電子系における新しい二次元フェロマグネティズムが明らかになった. この振る舞いは,異常な磁気特性と複雑なダイナミクスを示し,分数量子ホール効果の現在の理解に挑戦しています.

さらに関連する動画

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

関連する実験動画

Last Updated: Jun 30, 2026

Quantifying Mixing using Magnetic Resonance Imaging
07:33

Quantifying Mixing using Magnetic Resonance Imaging

Published on: January 25, 2012

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • Quantum Hall Effect (量子ホール効果) というものがあります.
  • 2次元の電子システム

背景:

  • 分数量子ホール効果 (FQHE) は,強い磁場下で二次元電子系における複雑な電子状態を記述する.
  • スピンと電子輸送の相互作用を理解することは,これらのFQHE状態を特徴づけるのに不可欠です.

研究 の 目的:

  • FQHE体制でほぼスピン退化型二次元電子システムの輸送特性を調査する.
  • スピン極化状態とスピン非極化状態の間の移行の性質を探求する.

主な方法:

  • 2次元電子システムにおける電気輸送の実験測定.
  • 磁気抵抗の分析と,異なる磁場と温度下での時間依存性.
  • FQHE状態間の移行時のヒステリックな行動の特徴.

主要な成果:

  • スピン極化状態 (nu = 1/3) とスピン非極化状態 (nu = 2/5) の間の移行中に異常なヒステリックループが観察され,古典的な鉄磁力学に似ている.
  • 磁気抵抗は,飽和なしの対数時間依存を示し,持続的動態を示した.
  • リラクゼーション率は,温度が下がるにつれて異常な差異を示し,確立されたモデルと矛盾しています.

結論:

  • この発見は,FQHE体制の中で,新しい二次元フェロマグネチズムの出現を示唆している.
  • 複雑な磁気領域のダイナミクスは,観察されたヒステリックおよびリラクゼーション輸送現象に関与しています.
  • これらの結果は,FQHEと低次元の磁気現象に関する現在の理論的枠組みの改訂を必要とします.