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Videos de Conceptos Relacionados

Magnetism01:30

Magnetism

6.4K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.4K
Diamagnetism01:26

Diamagnetism

2.4K
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....
2.4K
Paramagnetism01:30

Paramagnetism

2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Ferromagnetism01:31

Ferromagnetism

2.4K
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...
2.4K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

297
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...
297
Magnetic Force01:18

Magnetic Force

980
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...
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Video Experimental Relacionado

Updated: Jul 11, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Volviendo al magnetismo

Robert A Kaindl1

  • 1Department of Physics and Beus CXFEL Laboratory, Biodesign Institute, Arizona State University, Tempe, AZ, USA.

Science (New York, N.Y.)
|November 9, 2023
PubMed
Resumen

Los científicos usaron experimentos ultrarrápidos para controlar el magnetismo mediante la rotación precisa de los átomos. Este avance ofrece nuevas formas de manipular materiales magnéticos a nivel atómico.

Área de la Ciencia:

  • La física
  • Ciencias de los materiales
  • Mecánica Cuántica

Sus antecedentes:

  • El magnetismo es una propiedad fundamental de los materiales.
  • Controlar el magnetismo es crucial para tecnologías como el almacenamiento de datos y la espintrónica.
  • Los métodos existentes para el control magnético a menudo carecen de precisión o velocidad.

Objetivo del estudio:

  • Para demostrar un nuevo método para controlar la magnetización.
  • Para investigar el papel de las rotaciones atómicas en la dinámica magnética.
  • Explorar el potencial de las técnicas ultrarrápidas en la investigación del magnetismo.

Principales métodos:

  • Utilizando pulsos láser de femtosegundos para inducir y sondear la dinámica atómica.
  • Empleando difracción de rayos X con resolución de tiempo para observar el movimiento atómico.

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  • Medición de cambios en la magnetización en respuesta a las rotaciones atómicas controladas.

    • Principales resultados:

    • Las rotaciones atómicas fueron inducidas con éxito y controladas con precisión.
    • Se estableció una correlación directa entre los patrones específicos de rotación atómica y los cambios de magnetización.
    • Se logró un control ultrarrápido de la magnetización que superaba los límites anteriores.

    Conclusiones:

    • Las rotaciones atómicas ultrarrápidas proporcionan una nueva vía poderosa para controlar la magnetización.
    • Esta técnica abre caminos para desarrollar dispositivos magnéticos de próxima generación.
    • Los hallazgos avanzan en la comprensión fundamental de las interacciones luz-materia en los sistemas magnéticos.