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Related Concept Videos

Diamagnetism01:26

Diamagnetism

2.4K
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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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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Paramagnetism01:30

Paramagnetism

2.5K
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...
2.5K
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.
The vector...
263
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

3.8K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
3.8K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

630
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
630

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spontaneous Magnetization Induced by Antiferromagnetic Toroidal Ordering.

Satoru Hayami1

  • 1Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan.

Nanomaterials (Basel, Switzerland)
|November 8, 2024
PubMed
Summary

A staggered magnetic toroidal dipole moment can induce spontaneous magnetization in antiferromagnetic materials. This finding, observed in bilayer zigzag chains, highlights the role of spin-orbit coupling in magnetism.

Keywords:
antiferromagnetsantisymmetric spin-orbit interactionmagnetic toroidal dipolemagnetizationmultipolezigzag chain

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • The magnetic toroidal dipole moment arises from vortex-type spin textures.
  • It is linked to parity-breaking phenomena like linear magnetoelectric effects and nonreciprocal transport.

Purpose of the Study:

  • To investigate the emergence of spontaneous magnetization in antiferromagnetic structures.
  • To elucidate the role of staggered magnetic toroidal dipole alignment in inducing magnetization.

Main Methods:

  • Theoretical modeling of a bilayer zigzag chain.
  • Analysis of collinear antiferromagnetic structures with staggered magnetic toroidal dipole moments.
  • Investigating the interplay of antiferromagnetic mean field and spin-orbit coupling.

Main Results:

  • Demonstrated spontaneous magnetization in collinear antiferromagnetic structures.
  • Showcased the emergence of uniform magnetization due to staggered magnetic toroidal dipoles.
  • Identified the crucial role of relativistic spin-orbit coupling in magnetization induction.

Conclusions:

  • Staggered magnetic toroidal dipole alignment is a viable mechanism for achieving spontaneous magnetization in antiferromagnetic materials.
  • The interplay between antiferromagnetic ordering and spin-orbit coupling is key to this phenomenon.
  • This research opens avenues for novel magnetic materials and devices.