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Related Concept Videos

Magnetic Fields01:27

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...
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.
Magnetic Damping01:17

Magnetic Damping

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.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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...
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.

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Related Experiment Video

Updated: Jul 7, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
11:57

Fabricating Metamaterials Using the Fiber Drawing Method

Published on: October 18, 2012

A d.c. magnetic metamaterial.

F Magnus1, B Wood, J Moore

  • 1Physics Department, Imperial College London, Exhibition Road, London SW7 2AZ, UK.

Nature Materials
|February 26, 2008
PubMed
Summary
This summary is machine-generated.

Researchers created a novel non-resonant metamaterial operating at zero frequency using superconducting plates. This metamaterial exhibits a strong diamagnetic response, enabling potential applications in weak direct current (d.c.) magnetic field screening.

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Area of Science:

  • Physics
  • Materials Science
  • Electromagnetism

Background:

  • Electromagnetic metamaterials offer unique properties like negative refractive index.
  • Current research focuses on resonant designs, typically at microwave frequencies.
  • Artificial structuring on a subwavelength scale enables novel electromagnetic responses.

Purpose of the Study:

  • To experimentally realize a non-resonant metamaterial.
  • To achieve operation at zero frequency (direct current).
  • To investigate the magnetic properties of superconducting plate arrays.

Main Methods:

  • Fabrication of an anisotropic magnetic metamaterial using superconducting plates.
  • Magnetometry experiments to measure magnetic response.
  • Calculation of effective permeability.

Main Results:

  • Demonstrated the first experimental realization of a non-resonant metamaterial for zero frequency.
  • Observed a strong and adjustable diamagnetic response perpendicular to the plates.
  • Effective permeability calculations showed good agreement with theoretical predictions.

Conclusions:

  • The developed superconducting plate metamaterial is effective for zero-frequency applications.
  • This technology shows promise for non-intrusive screening of weak d.c. magnetic fields.
  • Advances the field of metamaterials beyond traditional resonant designs and higher frequencies.