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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

8.5K
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...
8.5K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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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
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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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Multiple Valley Modulations in Noncollinear Antiferromagnets.

Zhichao Zhou1, Huiqian Wang1,2, Xiao Li1,2

  • 1School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.

Nano Letters
|September 4, 2024
PubMed
Summary

Researchers explored noncollinear antiferromagnets for advanced information technology. They discovered tunable valley structures and properties, enabling new valleytronic devices without spin-orbit coupling.

Keywords:
anomalous Hall effectsfirst-principles calculationsnoncollinear antiferromagnetismspin−orbit couplingvalley splittings

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Two-dimensional (2D) valleys and magnetism are key areas in advanced information technology.
  • Coupling valleys to collinear magnetism lifts valley degeneracy, enabling valley degree of freedom exploitation.
  • New coupling modes between valleys and magnetism beyond collinearity are highly sought after.

Purpose of the Study:

  • To investigate tunable valley structures and properties in noncollinear antiferromagnets.
  • To explore novel coupling modes between valleys and magnetism.
  • To demonstrate the potential for energy-efficient valleytronic devices.

Main Methods:

  • Tight-binding calculations on a breathing Kagome lattice.
  • First-principles calculations of Fe3C6O6-silicene-Fe3C6O6 heterostructures.
  • Analysis of magnetic moment canting and azimuthal angles.

Main Results:

  • Demonstrated tunable valley structure and valley-contrasting properties in noncollinear antiferromagnets.
  • Showed that noncollinear antiferromagnetic order enables valley splitting without spin-orbit coupling.
  • Confirmed tunable valley splitting in a specific heterostructure, aligning with theoretical models.

Conclusions:

  • Noncollinear antiferromagnets offer new avenues for valley manipulation.
  • Magnetic moment angles provide experimental control over valley splitting.
  • This research paves the way for novel magnetic valley materials and efficient valleytronic devices.