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Related Concept Videos

Diamagnetism01:26

Diamagnetism

3.3K
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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Magnetic Fields01:27

Magnetic Fields

7.8K
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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Ferromagnetism01:31

Ferromagnetism

3.4K
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...
3.4K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

2.7K
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...
2.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.8K
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.
6.8K
Paramagnetism01:30

Paramagnetism

3.2K
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...
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Related Experiment Video

Updated: Mar 22, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Magnetic hyperbolic optical metamaterials.

Sergey S Kruk1, Zi Jing Wong2, Ekaterina Pshenay-Severin1,3

  • 1Nonlinear Physics Center and Center for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.

Nature Communications
|April 14, 2016
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate magnetic hyperbolic dispersion in 3D metamaterials, enabling enhanced thermal emission. This breakthrough overcomes limitations of previous materials, paving the way for efficient, impedance-matched hyperbolic media for unpolarized light.

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Area of Science:

  • Metamaterials
  • Electromagnetism
  • Optics

Background:

  • Hyperbolic media exhibit unique optical properties due to anisotropic permittivity or permeability.
  • Existing hyperbolic materials rely solely on electric response, limiting functionality and impedance matching.
  • Magnetic hyperbolic dispersion, using both electric and magnetic tensors, offers a path to overcome these limitations.

Purpose of the Study:

  • To experimentally demonstrate magnetic hyperbolic dispersion in three-dimensional metamaterials.
  • To investigate the topological phase transition between elliptic and hyperbolic dispersion.
  • To explore enhanced thermal emission properties in the hyperbolic regime.

Main Methods:

  • Fabrication and characterization of three-dimensional metamaterials.
  • Measurement of metamaterial isofrequency contours.
  • Analysis of thermal emission properties, including directionality, coherence, and polarization.

Main Results:

  • Experimental confirmation of magnetic hyperbolic dispersion in metamaterials.
  • Observation of a topological phase transition from elliptic to hyperbolic dispersion.
  • Demonstration of significantly enhanced, directional, coherent, and polarized thermal emission.

Conclusions:

  • The study successfully demonstrates magnetic hyperbolic dispersion in 3D metamaterials.
  • This achievement opens possibilities for overcoming polarization restrictions and impedance mismatch issues.
  • The findings pave the way for efficient hyperbolic media applicable to unpolarized light and advanced thermal emission applications.