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関連する概念動画

Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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, commutators...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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 Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
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.

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関連する実験動画

Updated: Jul 8, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

磁気トンネル交差点におけるスピン・トルク・ダイオード効果

A A Tulapurkar1, Y Suzuki, A Fukushima

  • 1Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.

Nature
|November 18, 2005
PubMed
まとめ

研究者らは,磁気トンネル交差点で新しいスピントロニック現象を発見した. ラジオ周波数電流を適用すると,特定の周波数で直流電圧が生み出され,電気通信用の潜在的ナノ検出器が可能になります.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

関連する実験動画

Last Updated: Jul 8, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

科学分野:

  • スピントロニクス (Spintronics) は,スピントロニクス (Spintronics) を開発したものです.
  • 凝縮物質物理学 凝縮物質物理学
  • ナノテクノロジー ナノテクノロジー

背景:

  • Spintronicデバイスは,従来の電子機器を超えた新しい機能のために電子スピンを活用します.
  • スピン極化電流は,磁気モメントにトルクを与え,回転を引き起こします.

研究 の 目的:

  • スピンダイナミクスとスピン依存輸送から生じる新しい現象を調査する.
  • 電波周波数検出器として磁気トンネル交差点の可能性を調査する.

主な方法:

  • ラジオ周波数交流電流をナノメートルスケールの磁気トンネル交差点に適用する.
  • 共振周波数における直流電圧生成の観測.
  • 外部磁場とのチューニング共鳴.

主要な成果:

  • 測定可能な直流電圧は,電波周波数電流の周波数がスピン振動共振と一致するときに生成されます.
  • 磁気トンネル交差点は,共鳴時の電流の方向に基づいて,異なる抵抗状態を示します.
  • この振る舞いは,従来の半導体ダイオードとは大きく異なる.

結論:

  • 観測された現象は,スピントルク効果とダイオード行動に基づいて,新しいスピントロニック機能を提供します.
  • この発見は,通信回路用のナノメートルスケールの無線周波数検出器の開発につながる可能性がある.