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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Ferromagnetism01:31

Ferromagnetism

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...
Paramagnetism01:30

Paramagnetism

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...
Diamagnetism01:26

Diamagnetism

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.
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Altermagnetic type-II multiferroics with Néel-order-locked electric polarization.

Wen-Ti Guo1, Junqi Xu1, Yurong Yang2

  • 1National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, China.

Nature Communications
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Altermagnets can generate electric polarization from their magnetic order, enabling type-II multiferroicity. This discovery opens new avenues for multifunctional spintronic devices utilizing altermagnetism.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism is an emergent magnetic phase with compensated collinear magnetic moments and momentum-dependent spin splittings.
  • A key question is whether altermagnets can exhibit type-II multiferroicity through spontaneous electric polarization.

Purpose of the Study:

  • To demonstrate the generation of electric polarization by altermagnetic Néel order.
  • To classify the locking behaviors between Néel order and electric polarization in two-dimensional altermagnets.
  • To propose experimental methods for identifying these phenomena.

Main Methods:

  • Symmetry analysis and metal-ligand model were employed.
  • First-principles calculations were performed on monolayer MgFe2N2.
  • Magneto-optical microscopy was proposed for identification.

Main Results:

  • Explicit demonstration of electric polarization generation by altermagnetic Néel order.
  • Classification of eight distinct locking behaviors for 2D altermagnets.
  • Monolayer MgFe2N2 identified as a prototypical altermagnetic type-II multiferroic.

Conclusions:

  • Altermagnetic Néel order can induce electric polarization, realizing type-II multiferroicity.
  • The findings provide a framework for understanding and designing altermagnetic multiferroics.
  • This research paves the way for novel altermagnetic multifunctional spintronics.