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Videos de Conceptos Relacionados

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...
Ferromagnetism01:31

Ferromagnetism

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...
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...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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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Video Experimental Relacionado

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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
07:44

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy

Published on: April 27, 2016

Respuesta magnética en terahercios de los materiales artificiales.

T J Yen1, W J Padilla, N Fang

  • 1Department of Mechanical and Aerospace Engineering, University of California at Los Angeles, 420 Westwood Plaza, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)
|March 6, 2004
PubMed
Resumen

Los investigadores demuestran la respuesta magnética en frecuencias de terahertz utilizando elementos de resonancia conductiva no magnética en una estructura plana. Este efecto de banda ancha es ajustable mediante la alteración de las dimensiones estructurales, allanando el camino para los dispositivos avanzados de terahertz.

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Área de la Ciencia:

  • Terahertz (THz) ciencia y tecnología.
  • Los metamateriales y el magnetismo artificial

Sus antecedentes:

  • Las frecuencias de terahercios (THz) presentan desafíos únicos para generar y controlar respuestas magnéticas.
  • Los materiales magnéticos tradicionales a menudo exhiben una funcionalidad limitada o pérdidas en las frecuencias THz.

Objetivo del estudio:

  • Demostrar un método para lograr una respuesta magnética en frecuencias de terahertz utilizando componentes no magnéticos.
  • Para explorar la sintonizabilidad y el ancho de banda de esta respuesta magnética artificial.

Principales métodos:

  • Fabricación de una estructura plana utilizando elementos resonantes conductores no magnéticos.
  • Caracterización de la respuesta de la estructura a través de una amplia gama de frecuencias de terahertz.

Principales resultados:

  • Se logró con éxito una respuesta magnética significativa en frecuencias de terahertz.
  • Se demostró que la respuesta magnética es de banda ancha y se puede ajustar al escalar las dimensiones de la estructura.
  • Confirmó la naturaleza no magnética de los elementos constituyentes.

Conclusiones:

  • Las estructuras magnéticas artificiales compuestas de elementos conductores no magnéticos son viables para aplicaciones THz.
  • La capacidad de ajuste de la estructura demostrada ofrece flexibilidad para el diseño de dispositivos THz.
  • Las estructuras híbridas que combinan materiales magnéticos naturales y artificiales son prometedoras para el futuro desarrollo de dispositivos THz.