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Magnetic Fields01:27

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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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Magnetic Field Due To A Thin Straight Wire01:28

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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.
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Magnetic Field Of A Current Loop01:16

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field due to Moving Charges01:23

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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...
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Ferromagnetism01:31

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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...
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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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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Un ferromagnético en un campo aleatorio continuamente sintonizable.

D M Silevitch1, D Bitko, J Brooke

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

Nature
|August 3, 2007
PubMed
Resumen

Los imanes desordenados exhiben una respuesta magnética singular por encima de su temperatura de Curie, que diverge anómalo en T ((C).). Este hallazgo avanza en la comprensión del problema del campo aleatorio y ofrece información sobre el fijación de pared de dominio para aplicaciones.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada
  • Ciencia de los materiales Ciencia de los materiales.
  • El magnetismo es el magnetismo.

Sus antecedentes:

  • La mayoría de los sistemas físicos están desordenados, sin embargo, los modelos teóricos a menudo tratan el desorden como una perturbación menor.
  • Los ferromagnetos cerca de su temperatura de Curie (T ((C)) típicamente muestran un comportamiento crítico suprimido con sustitución química aleatoria.
  • Las mediciones a granel en ferromagnetos desordenados generalmente no revelan fenómenos cualitativamente nuevos por debajo de un nivel crítico de desorden.

Objetivo del estudio:

  • Para investigar la respuesta magnética de un modelo de imán desordenado.
  • Identificar nuevos fenómenos en sistemas magnéticos desordenados.
  • Explorar las implicaciones para la física fundamental y las aplicaciones tecnológicas.

Principales métodos:

  • Estudiando un modelo de sistema magnético desordenado.
  • Medir la respuesta magnética, en particular la susceptibilidad.
  • Aplicación de un campo magnético externo transversal a la dirección de magnetización.

Principales resultados:

  • Se observó una respuesta magnética singular por encima de la temperatura de Curie (T (C)).
  • Esta singularidad exhibió una divergencia anómala precisamente en T(C).
  • La respuesta se origina en un campo interno aleatorio inducido por un campo magnético externo transversal.

Conclusiones:

  • Los imanes desordenados muestran un comportamiento único cerca de su temperatura de Curie.
  • Los fenómenos observados están relacionados con el efecto de campo aleatorio en los sistemas magnéticos.
  • Los hallazgos sugieren un potencial para ajustar el fijación de la pared del dominio, crucial para aplicaciones magnéticas.