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Videos de Conceptos Relacionados

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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Video Experimental Relacionado

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

Efecto del diodo de torsión en las uniones de túneles magnéticos.

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
Resumen

Los investigadores descubrieron un nuevo fenómeno espintrónico en las uniones de túneles magnéticos. La aplicación de corriente de radiofrecuencia genera tensión de corriente continua a frecuencias específicas, lo que permite la creación de nanodetectores potenciales para las telecomunicaciones.

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Área de la Ciencia:

  • Spintronics es una empresa de Spintronics.
  • Física de la materia condensada Física de la materia condensada
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los dispositivos espintrónicos aprovechan el espín de los electrones para nuevas funcionalidades más allá de la electrónica convencional.
  • Las corrientes polarizadas por espín ejercen un par sobre los momentos magnéticos, causando la rotación.

Objetivo del estudio:

  • Para investigar un fenómeno novedoso que surge de la dinámica de espín y el transporte dependiente de espín.
  • Explorar el potencial de las uniones de túneles magnéticos como detectores de radiofrecuencia.

Principales métodos:

  • Aplicación de corriente alterna de radiofrecuencia a una unión de túnel magnético a escala nanométrica.
  • Observación de la generación de tensión de corriente continua en frecuencias de resonancia.
  • Resonancia de afinación con un campo magnético externo.

Principales resultados:

  • Se genera un voltaje medible de corriente continua cuando la frecuencia de la corriente de radiofrecuencia coincide con la frecuencia de la resonancia de oscilación de espín.
  • La unión del túnel magnético exhibe distintos estados de resistencia basados en la dirección de la corriente en la resonancia.
  • Este comportamiento difiere significativamente de los diodos semiconductores convencionales.

Conclusiones:

  • El fenómeno observado, basado en los efectos del par de giro y el comportamiento del diodo, ofrece nuevas funcionalidades spintrónicas.
  • Este descubrimiento podría conducir al desarrollo de detectores de radiofrecuencia a escala nanométrica para circuitos de telecomunicaciones.