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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...
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Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Eddy Currents01:25

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Energy In A Magnetic Field01:24

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Magnetic Force01:18

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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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Magnetic Damping01:17

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Medios magnéticos de ingeniería de espín de ingeniería magnética.

S P Li1, W S Lew, J A C Bland

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK. jacb1@phy.cam.ac.uk

Nature
|February 8, 2002
PubMed
Resumen
Este resumen es generado por máquina.

Los nuevos medios magnéticos utilizan configuraciones de espín diseñadas en películas homogéneas para aumentar la densidad de almacenamiento de datos. Este método altera la anisotropía magnética para arreglos de espín regular, manteniendo la integridad del material y la planaridad de la superficie.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • La creciente demanda de mayor densidad de almacenamiento de datos requiere nuevos medios magnéticos.
  • Las tecnologías actuales de almacenamiento magnético se enfrentan a limitaciones en densidad y estabilidad.

Objetivo del estudio:

  • Introducir un nuevo tipo de medio magnético con configuraciones de espín diseñadas.
  • Demostrar un método para definir los arreglos de giro regulares en el plano y fuera del plano.
  • Para mantener la planitud de la superficie y la homogeneidad del material en medios magnéticos avanzados.

Principales métodos:

  • Configuraciones de espín de ingeniería dentro de películas magnéticas químicamente homogéneas.
  • Modificación de la anisotropía magnética para definir arreglos de espín específicos.
  • Utilizando técnicas de fabricación simples y fácilmente integrables.

Principales resultados:

  • Se crearon con éxito configuraciones de giro regularmente dispuestas en el plano y fuera del plano.
  • Mantuvo la planitud superficial de las películas magnéticas.
  • Conserva la homogeneidad química de los materiales magnéticos.

Conclusiones:

  • Los medios desarrollados por ingeniería de giro ofrecen un enfoque prometedor para el almacenamiento de datos de próxima generación.
  • La simplicidad del método y la facilidad de integración sugieren una rápida aplicabilidad.
  • Esta técnica aborda la necesidad de aumentar la densidad de almacenamiento de datos en medios magnéticos.