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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Diamagnetism01:26

Diamagnetism

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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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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Potential Due to a Magnetized Object01:24

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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...
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La polarización de ondas y el bloqueo de espín en altermagnetos bidimensionales

Zhao Liu1,2,3, Nikhil V Medhekar2,3

  • 1Centre of Quantum Technology Theory, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.

Nano letters
|August 29, 2025
PubMed
Resumen

Descubrimos el bloqueo de espín de polarización de onda d (PSL) en altermagnetos 2D, un nuevo fenómeno donde los electrones de giro hacia arriba y hacia abajo exhiben polarizaciones perpendiculares. Este hallazgo abre las puertas a dispositivos espintrónicos avanzados y nuevas tecnologías de memoria.

Palabras clave:
Conexión de las bayasel altermagnetismoBloqueo de la polarización y el giro de la onda dBloqueo del momento de giro

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Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales
  • La tecnología Spintronics

Sus antecedentes:

  • Los alterimanes bidimensionales exhiben propiedades electrónicas únicas.
  • Comprender los fenómenos dependientes del espín es crucial para la electrónica de próxima generación.

Objetivo del estudio:

  • Para informar sobre el descubrimiento del bloqueo de la polarización-espín de la onda d (PSL) en altermagnetos 2D.
  • Establecer criterios para la identificación de los materiales que muestran PSL de ondas d.
  • Para explorar las posibles aplicaciones de este fenómeno.

Principales métodos:

  • Propuesta teórica de un criterio de simetría-valor propio.
  • Observación experimental del bloqueo del momento de giro.
  • Cálculos basados en principios para la identificación de materiales candidatos.

Principales resultados:

  • Aparición de PSL de onda d debido a las conexiones no triviales de Berry.
  • Polarizaciones electrónicas perpendiculares en canales de giro hacia arriba y hacia abajo.
  • Identificación de una sola capa de Cr2X2O (X = Se, Te) como candidatos prometedores.
  • Observación de la ferroelectricidad impulsada por el espín en antiferromagnetos.

Conclusiones:

  • La PSL de onda D permite la acumulación de espín ortogonal para aplicaciones espintrónicas como filtros / divisores de espín.
  • Este fenómeno proporciona una plataforma para dispositivos de memoria antiferromagnéticos rápidos a través del acoplamiento magnetoeléctrico.