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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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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.
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Diamagnetism01:26

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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.
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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.
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Paramagnetism01:30

Paramagnetism

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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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Ferromagnetism01:31

Ferromagnetism

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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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Ampere's Law in Matter01:22

Ampere's Law in Matter

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The total current density in magnetized material is the sum of the free and bound current densities. The free current arises due to the motion of free electrons within the material, while the bound current arises due to the alignment of magnetic dipole moments.
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Magnetoelectric effects in local light-matter interactions.

Konstantin Y Bliokh1, Yuri S Kivshar2, Franco Nori3

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This study explores how symmetry breaking in bi-isotropic nanoparticles affects light interaction. Researchers propose using complex fields to detect the nonreciprocal magnetoelectric effect in these materials.

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Area of Science:

  • Electromagnetism and Optics
  • Materials Science
  • Nanotechnology

Background:

  • Investigating light-matter interactions is crucial for developing advanced optical materials.
  • Bi-isotropic materials exhibit unique responses to electromagnetic fields due to broken symmetries.
  • Understanding electric-magnetic asymmetry, chirality, and nonreciprocal effects is key for novel applications.

Purpose of the Study:

  • To analyze the dipole interaction of electromagnetic fields with bi-isotropic nanoparticles or molecules.
  • To quantify energy, momentum, and angular momentum transfer arising from dual, P, and T symmetry breaking.
  • To introduce novel field characteristics and a concept of magnetoelectric energy density.

Main Methods:

  • Theoretical analysis of monochromatic free-space electromagnetic field interaction.
  • Calculation of absorption rates, radiation forces, and radiation torques.
  • Development of new field characteristics to quantify symmetry-breaking effects.

Main Results:

  • Identified contributions of dual, P, and T symmetry breaking to electric-magnetic asymmetry, chirality, and nonreciprocal magnetoelectric effects.
  • Introduced novel field characteristics for quantifying energy, momentum, and angular momentum transfer.
  • Proposed "magnetoelectric energy density" as a measure of local PT symmetry.

Conclusions:

  • Symmetry breaking in bi-isotropic nanoparticles leads to distinct optical phenomena.
  • Complex fields can be employed to sensitively probe the nonreciprocal magnetoelectric effect.
  • This research offers new tools for characterizing and utilizing advanced optical materials.