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Videos de Conceptos Relacionados

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Magnetic Fields01:28

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...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Field due to Moving Charges01:25

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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: Jul 12, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Las oscilaciones de espín coherentes en un imán desordenado.

S Ghosh1, R Parthasarathy, T F Rosenbaum

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)
|June 22, 2002
PubMed
Resumen

Los investigadores descubrieron un nuevo estado líquido de espín en materiales magnéticos. Este estado exhibe propiedades espectrales únicas y permite la codificación simultánea de información en múltiples frecuencias.

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Last Updated: Jul 12, 2026

Magnetic Tweezers for the Measurement of Twist and Torque
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Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Published on: June 9, 2016

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • El magnetismo cuántico es el magnetismo cuántico.

Sus antecedentes:

  • Los lentes convencionales exhiben propiedades espectrales únicas al enfriarse.
  • Los dipolos magnéticos en matrices sólidas suelen congelarse a bajas temperaturas.

Objetivo del estudio:

  • Para investigar el comportamiento a bajas temperaturas de los dipolos magnéticos distribuidos al azar en una matriz sólida.
  • Para caracterizar las propiedades espectrales y la dinámica del estado condensado.

Principales métodos:

  • Refrigeración de una matriz sólida con dipolos magnéticos distribuidos al azar a bajas temperaturas.
  • Medición de la dinámica magnética no lineal.
  • Analizando las propiedades espectrales y las oscilaciones de espín.

Principales resultados:

  • Los dipolos magnéticos se condensan en un estado líquido de espín, exhibiendo propiedades espectrales opuestas a las gafas convencionales.
  • Se observaron oscilaciones de giro coherentes que involucraban cientos de giros con vidas de hasta 10 segundos.
  • Estas excitaciones de espín son sintonizables en frecuencia y manipulables por campos magnéticos.

Conclusiones:

  • El líquido de espín descubierto representa un nuevo estado de la materia con propiedades magnéticas únicas.
  • Las oscilaciones de espín coherentes ofrecen potencial para la codificación de información avanzada y las tecnologías cuánticas.