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Videos de Conceptos Relacionados

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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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...
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Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
2.4K
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

12.3K
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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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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Video Experimental Relacionado

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Torque de transferencia de giro generado por un aislante topológico.

A R Mellnik1, J S Lee2, A Richardella2

  • 1Cornell University, Ithaca, New York 14853, USA.

Nature
|July 25, 2014
PubMed
Resumen

Los aislantes topológicos como el selenuro de bismuto controlan eficientemente los materiales magnéticos utilizando un par de transferencia de espín. Este avance podría conducir a dispositivos avanzados de memoria magnética y dispositivos lógicos de baja potencia.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales Ciencia de los materiales.
  • Spintronics es una empresa de Spintronics.

Sus antecedentes:

  • Los dispositivos magnéticos ofrecen soluciones de memoria y lógica no volátiles, de alta densidad, alta velocidad y duraderas.
  • La manipulación eficiente de la magnetización impulsada por corriente es crucial para la adopción generalizada de las tecnologías magnéticas.
  • Las interacciones espín-órbita, a través de los efectos de espín Hall o Rashba-Edelstein, son mecanismos clave para los torques impulsados por corriente.

Objetivo del estudio:

  • Investigar el potencial de los aislantes topológicos, específicamente el selenuro de bismuto (Bi2Se3), para obtener torques eficientes inducidos por la órbita de giro.
  • Para demostrar experimentalmente el par de transferencia de giro impulsado por corriente desde los estados de superficie del aislante topológico a las capas ferromagnéticas adyacentes.
  • Para evaluar la eficiencia de Bi2Se3 como una fuente de par de giro para la manipulación magnética.

Principales métodos:

  • Fabricación de películas delgadas que comprenden un aislante topológico (Bi2Se3) y un ferromagnético (permalloy, Ni81Fe19).
  • Mediciones de transporte eléctrico a temperatura ambiente para detectar los efectos magnéticos inducidos por la corriente.
  • Análisis de la fuerza del par por unidad de densidad de corriente de carga.

Principales resultados:

  • La corriente de carga en Bi2Se3 generó un fuerte par de transferencia de giro en la película adyacente de Ni81Fe19.
  • La dirección del par observada se alinea con las predicciones de los estados de la superficie del aislante topológico.
  • La eficiencia del par en Bi2Se3 superó las fuentes de par de transferencia de giro reportadas anteriormente, incluso en películas con conducción a granel.

Conclusiones:

  • Los aislantes topológicos, como el Bi2Se3, son fuentes altamente efectivas de par de transferencia de giro.
  • Esta investigación demuestra la viabilidad del uso de aislantes topológicos para la manipulación eléctrica eficiente de materiales magnéticos.
  • Los hallazgos sugieren un camino prometedor hacia el desarrollo de dispositivos lógicos y de memoria magnética de baja potencia de próxima generación que funcionen a temperatura ambiente.