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Related Concept Videos

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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Magnetic Force Between Two Parallel Currents01:13

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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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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Potential Due to a Magnetized Object01:24

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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

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.
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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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Updated: Apr 13, 2026

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Floquet Odd-Parity Collinear Magnets.

Tongshuai Zhu1, Di Zhou2, Huaiqiang Wang3,4,5

  • 1China University of Petroleum (East China), College of Science, Qingdao 266580, China.

Physical Review Letters
|April 11, 2026
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Summary
This summary is machine-generated.

Researchers induced novel odd-parity altermagnets from antiferromagnets using circularly polarized light. This discovery introduces Floquet odd-parity collinear magnets and opens new avenues for spintronics.

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Quantum magnetism

Background:

  • Altermagnets are unconventional magnets with alternating collinear magnetic moments.
  • They exhibit even-parity spin-split bands in momentum space.
  • Odd-parity spin splittings were previously thought absent in collinear magnets.

Purpose of the Study:

  • To investigate the possibility of inducing odd-parity spin splittings in collinear magnets.
  • To explore novel magnetic states via symmetry engineering.
  • To demonstrate light-induced unconventional magnetism.

Main Methods:

  • Symmetry engineering of collinear antiferromagnets.
  • Effective model analysis within Floquet theory.
  • First-principles calculations for MnPSe3 under circularly polarized light.

Main Results:

  • Circularly polarized light breaks spin-preserving pseudo-time-reversal symmetry in antiferromagnetic lattices.
  • This induces novel p-wave and f-wave magnets, termed Floquet odd-parity collinear magnets.
  • Light-induced antiferromagnetic Chern insulating states were observed in f-wave magnets.

Conclusions:

  • A new class of unconventional magnets, Floquet odd-parity collinear magnets, has been proposed.
  • Symmetry engineering with light offers a route to realize exotic magnetic states.
  • This work paves the way for light-controllable spintronic devices.