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Related Concept Videos

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...
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...
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.
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 Moving Charges01:23

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 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...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Zero loss magnetic metamaterials using powered active unit cells.

Yu Yuan1, Bogdan-Ioan Popa, Steven A Cummer

  • 1Center for Metamaterials and Integrated Plasmonics and Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA. yuyuan.06@gmail.com

Optics Express
|September 3, 2009
PubMed
Summary
This summary is machine-generated.

We designed a novel active magnetic metamaterial with tunable permeability. This technology overcomes material loss limitations in performance-critical applications.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Metamaterials offer unique electromagnetic properties not found in natural materials.
  • Material losses in metamaterials limit their practical applications, especially in magnetic applications.
  • Active control over metamaterial properties is crucial for overcoming inherent limitations.

Purpose of the Study:

  • To design and experimentally measure a powered active magnetic metamaterial with tunable permeability.
  • To demonstrate the capability of achieving negative permeability with zero loss or gain.
  • To explore applications for active metamaterials in overcoming performance limitations due to material losses.

Main Methods:

  • The unit cell design integrates a radiofrequency amplifier and a tunable phase shifter.
  • Experimental measurements were conducted to validate the designed metamaterial's response.
  • An array of unit cells was used to create the active metamaterial.

Main Results:

  • Tunable permeability was experimentally achieved in the active magnetic metamaterial.
  • Negative permeability was demonstrated with the potential for zero loss or signal gain.
  • The active metamaterial's performance was confirmed through array measurements.

Conclusions:

  • The developed active magnetic metamaterial offers a viable solution for mitigating material loss issues.
  • This technology has significant potential for applications currently limited by material losses.
  • Tunable permeability and loss compensation are key features for future metamaterial devices.