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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
The Hall Effect01:30

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Electromagnetic Fields01:30

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of Gauss's...
Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Video Experimental Relacionado

Updated: May 7, 2026

Fabrication and Operation of a Nano-Optical Conveyor Belt
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Nanoantena de Espín de Hall

Raisa Fabiha1, Pratap Kumar Pal2, Michael Suche1

  • 1Department of Electrical and Computer Engineering, Virginia Commonwealth University, Richmond, Virginia, USA.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 25, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una novedosa nanoantena de espín de Hall (SHNA) que actúa como una antena electromagnética/acústica dual. Este dispositivo de espintrónica permite la miniaturización extrema para la transmisión y recepción de señales de alta frecuencia.

Palabras clave:
efecto Hall inverso de espínacoplamiento magnón-fotónnanoantenaefecto Hall de espínbombeo de espínpar de torsión espín-órbita

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Área de la Ciencia:

  • Espintrónica
  • Nanotecnología
  • Electromagnetismo

Sus antecedentes:

  • El efecto Hall de espín es crucial en espintrónica, principalmente para la electrónica digital.
  • Las aplicaciones análogas del efecto Hall de espín son limitadas, siendo los nanoosciladores de Hall de espín (SHNO) una excepción notable.

Objetivo del estudio:

  • Presentar una nanoantena de espín de Hall (SHNA) como análoga de la SHNO.
  • Demostrar la capacidad de la SHNA para la radiación dual de ondas electromagnéticas y acústicas.
  • Explorar el potencial de la SHNA para la miniaturización extrema de antenas.

Principales métodos:

  • Fabricación de SHNAs utilizando arreglos de nanomagnets magnetostrictivos y nano-cintas de metales pesados.
  • Utilización del efecto Hall de espín para generar pares de torsión espín-órbita (SOTs) e inducir oscilaciones de magnetización (ondas de espín/magnones).
  • Investigación de la conversión de magnones a fotones para la radiación de ondas electromagnéticas y viceversa para la recepción a través del efecto Hall inverso de CA.

Principales resultados:

  • La SHNA funciona como una antena transmisora al irradiar ondas electromagnéticas de alta frecuencia.
  • La SHNA también puede irradiar ondas acústicas a un sustrato si se utilizan materiales magnetostrictivos.
  • El dispositivo exhibe patrones de radiación anisotrópicos a pesar de su tamaño sublongitudinal de onda.
  • La SHNA opera como una antena receptora, convirtiendo la radiación electromagnética incidente en voltaje alterno.
  • La SHNA demuestra una ganancia de transmisión/recepción y una eficiencia de radiación significativamente mayores en comparación con las antenas convencionales de tamaño similar.

Conclusiones:

  • La nanoantena de espín de Hall (SHNA) representa un avance significativo en las aplicaciones análogas de espintrónica.
  • La naturaleza dual electromagnética/acústica y la alta eficiencia de la SHNA permiten una miniaturización de antenas sin precedentes.
  • Esta tecnología promete para futuras comunicaciones de alta frecuencia y sistemas de detección.