Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

3.0K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
3.0K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.3K
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...
1.3K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.3K
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.
1.3K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.6K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.6K
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

10.0K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
10.0K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.1K
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 one, the...
2.1K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Combination of 3D and 2D Small and Wide Angle X-Ray Scattering Imaging Reveals Diminished Bone Quality in the Superior Human Femoral Neck Cortex.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Generating Unconventional Spin-Orbit Torques With Patterned Phase Gradients in Tungsten Thin Films.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

In situ ptychographic x-ray nanotomography of temperature-controlled crystallization processes.

Nature communications·2026
Same author

In situ ptychographic nanotomography captures activation, mobility, and deactivation of supported catalysts.

Nature communications·2026
Same author

Engineering and Exploiting Self-Driven Domain Wall Motion in Ferrimagnets for Neuromorphic Computing Applications.

Nano letters·2026
Same author

Quantifying Trace Metals in Gunflint Microfossils by 3D Correlative X-ray Nanoimaging.

Analytical chemistry·2026

Video Experimental Relacionado

Updated: Feb 26, 2026

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
10:00

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles

Published on: July 5, 2016

12.5K

Las estructuras tridimensionales de magnetización reveladas con la nanotomografía vectorial de rayos X

Claire Donnelly1,2, Manuel Guizar-Sicairos2, Valerio Scagnoli1,2

  • 1Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.

Nature
|July 21, 2017
PubMed
Resumen

Los investigadores desarrollaron una nanotomografía vectorial de rayos X dura para obtener imágenes de estructuras magnéticas en 3D en materiales ferromagnéticos blandos. Esta técnica observó directamente los puntos de Bloch, predijo singularidades magnéticas y reveló nuevas configuraciones en imanes a granel.

Más Videos Relacionados

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
06:27

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Published on: July 2, 2018

8.6K
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

8.7K

Videos de Experimentos Relacionados

Last Updated: Feb 26, 2026

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
10:00

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles

Published on: July 5, 2016

12.5K
Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
06:27

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Published on: July 2, 2018

8.6K
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

8.7K

Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales
  • Nanotecnología

Sus antecedentes:

  • Los materiales ferromagnéticos blandos exhiben patrones magnéticos complejos como dominios y vórtices.
  • El estudio de las estructuras magnéticas 3D en materiales más gruesos (micrómetros) es un desafío con los métodos actuales.
  • Las técnicas existentes se limitan a películas delgadas (hasta 200 nm) y son accesibles a través de imágenes de rayos X electrónicos o blandos.

Objetivo del estudio:

  • Desarrollar y aplicar una nueva técnica de imagen para la determinación de la estructura magnética 3D a nanoescala en materiales a granel.
  • Para observar y caracterizar directamente las singularidades magnéticas evasivas, como los puntos de Bloch, en tres dimensiones.
  • Investigar las texturas nanomagnéticas internas críticas para comprender las propiedades y aplicaciones magnéticas a granel.

Principales métodos:

  • Desarrollo de la nanotomografía vectorial de rayos X para el mapeo de configuración magnética 3D a nanoescala.
  • Tomando imágenes de un pilar magnético suave de 5 micrómetros de diámetro con una resolución espacial de 100 nanómetros.
  • Análisis de configuraciones magnéticas complejas, incluidos vórtices, antivórtices y sus paredes asociadas.

Principales resultados:

  • Observación directa de una estructura magnética 3D compleja dentro del grueso de un pilar magnético suave.
  • La primera imagen directa de los puntos de Bloch, predijo singularidades magnéticas, en la intersección de las estructuras magnéticas.
  • Identificación de dos posibles configuraciones de magnetización cerca de los puntos de Bloch: una estructura circulante y un estado retorcido de "punto anti-Bloch".

Conclusiones:

  • La nanotomografía vectorial de rayos X dura permite el estudio a nanoescala de las estructuras magnéticas topológicas en sistemas de tamaño micrométrico.
  • La observación directa de los puntos de Bloch proporciona una visión crucial de los fenómenos magnéticos fundamentales.
  • Comprender las texturas nanomagnéticas internas es vital para avanzar en el diseño de imanes a granel y las aplicaciones tecnológicas.