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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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.
A magnetic field is defined by the force that a charged particle experiences...
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...
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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Ferroelectric Switchable Altermagnetism.

Mingqiang Gu1, Yuntian Liu1, Haiyuan Zhu1

  • 1Southern University of Science and Technology, Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science, Shenzhen 518055, China.

Physical Review Letters
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

We discovered a new effect where electric polarization controls magnetic spin splitting in ferroelectric altermagnets. This breakthrough enables electric-field-controllable multiferroic devices and novel spintronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism exhibits unique spin-splitting properties.
  • Ferroelectric materials possess switchable electric polarization.
  • Coupling these properties offers new avenues for electronic control.

Purpose of the Study:

  • To propose and demonstrate the ferroelectric switchable altermagnetism effect.
  • To identify design principles and symmetry constraints for such materials.
  • To explore potential applications in multiferroic devices.

Main Methods:

  • Utilized spin-group symmetry analysis.
  • Screened the MAGNDATA database for candidate materials.
  • Investigated the coupling in [C(NH2)3]Cr(HCOO)3 using theoretical methods.

Main Results:

  • Identified 22 ferroelectric altermagnets, with two exhibiting switchable altermagnetism.
  • Demonstrated tight coupling between ferroelectric polarization and altermagnetic spin splitting.
  • Proposed detection via Berry curvature dipole related quantities like spin current.

Conclusions:

  • Ferroelectric switchable altermagnetism is a viable phenomenon.
  • This effect provides a platform for electric-field-controllable multiferroic devices.
  • Potential for novel spintronic applications and detection mechanisms.