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Videos de Conceptos Relacionados

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 Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
Diamagnetism01:26

Diamagnetism

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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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Oportunidades en los materiales magnéticos.

R M White

    Science (New York, N.Y.)
    |July 5, 1985
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los nuevos materiales magnéticos ofrecen un rendimiento mejorado del dispositivo y nuevas aplicaciones. Los descubrimientos en compuestos a base de boro, transformadores amorfos y películas magnéticas están impulsando la innovación en motores, eficiencia energética y almacenamiento de datos.

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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
    • La ingeniería de ingeniería de ingeniería.

    Sus antecedentes:

    • Los avances en los materiales magnéticos son cruciales para mejorar las tecnologías actuales.
    • Los nuevos materiales magnéticos permiten el desarrollo de dispositivos de próxima generación con un rendimiento superior.
    • Las aplicaciones van desde transformadores energéticamente eficientes hasta almacenamiento de datos de alta densidad.

    Objetivo del estudio:

    • Para resaltar los recientes descubrimientos en materiales magnéticos.
    • Identificar el impacto potencial de estos materiales en diversas aplicaciones.
    • Para esbozar los principales desafíos técnicos asociados con estos nuevos materiales.

    Principales métodos:

    • Revisión de la literatura de los avances recientes en los materiales magnéticos.
    • Análisis de las mejoras de rendimiento ofrecidas por los nuevos materiales magnéticos.
    • Identificación y categorización de desafíos técnicos.

    Principales resultados:

    • Los compuestos ternários basados en boro permiten diseños prácticos de motores compactos.
    • Los materiales transformadores amorfos reducen significativamente las pérdidas de alta frecuencia.
    • Las películas finas de aleación magnética proporcionan mayores densidades de almacenamiento de datos.

    Conclusiones:

    • Los recientes descubrimientos en materiales magnéticos prometen avances tecnológicos significativos.
    • Estos materiales están listos para revolucionar sectores que incluyen motores eléctricos, transformadores de potencia y almacenamiento de datos.
    • Abordar los problemas técnicos identificados es clave para aprovechar al máximo el potencial de estos nuevos materiales magnéticos.