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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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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.
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

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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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Magnetic Fields01:27

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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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Magnetic Damping01:17

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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.
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Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Magnetic Field Due to Two Straight Wires01:18

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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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Spin Demons in d-Wave Altermagnets.

Pieter M Gunnink1, Jairo Sinova1, Alexander Mook1

  • 1Johannes Gutenberg University Mainz, Staudingerweg 7, Mainz 55128, Germany.

Physical Review Letters
|October 5, 2025
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Summary
This summary is machine-generated.

Researchers discovered a novel phenomenon called a spin demon in d-wave altermagnets. This spin demon, an underdamped excitation, exhibits unique magnetic properties and exists in both 2D and 3D materials.

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Area of Science:

  • Condensed matter physics
  • Quantum magnetism

Background:

  • Plasmons involve out-of-phase electron oscillations.
  • Altermagnets are a new class of collinear magnetic materials.

Purpose of the Study:

  • To investigate the existence and properties of spin demons in d-wave altermagnets.
  • To explore the nature of spin excitations in these materials.

Main Methods:

  • Theoretical analysis of d-wave altermagnet systems.
  • Investigating electron band structures and spin dynamics.

Main Results:

  • D-wave altermagnets naturally host a spin demon.
  • The spin demon is an underdamped excitation with quality factors >10.
  • The spin demon carries a magnetic moment with d-wave symmetry.

Conclusions:

  • Spin demons are a new type of excitation in d-wave altermagnets.
  • These phenomena are robust and exist in both 2D and 3D.
  • This discovery opens new avenues for exploring spin dynamics in magnetic materials.