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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...
2.4K
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....
2.4K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

880
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...
880
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

263
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.
The vector...
263
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

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Two-Dimensional Ferroelectric Altermagnets: From Model to Material Realization.

Ziye Zhu1,2, Xunkai Duan1,3, Jiayong Zhang1,2,4

  • 1Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang 315200, China.

Nano Letters
|May 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a design for two-dimensional ferroelectric altermagnets (FEAM), enabling electrically controlled spintronics. Lattice distortions allow coexistence of ferroelectricity and altermagnetism, crucial for advanced electronic devices.

Keywords:
2D materialsaltermagnetsferroelectricsmultiferroicsspintronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Multiferroic altermagnets present opportunities for magnetoelectric coupling and tunable spintronics.
  • Coexistence of altermagnetism and ferroelectricity (FEAM) is challenging in 2D systems due to symmetry conflicts.

Purpose of the Study:

  • To propose a universal, symmetry-based design principle for achieving 2D ferroelectric altermagnets (FEAM).
  • To identify candidate materials and experimental probes for 2D FEAM.

Main Methods:

  • Symmetry analysis
  • Tight-binding models
  • First-principles calculations
  • Identification of specific material families (vanadium oxyhalides and sulfide halides)

Main Results:

  • Demonstrated that lattice distortions can enable coexistence of altermagnetism and ferroelectricity in 2D systems.
  • Identified 2D vanadium oxyhalides and sulfide halides as promising FEAM candidates.
  • Proposed the magneto-optical Kerr effect for experimental verification.

Conclusions:

  • Established a practical framework for designing 2D FEAM.
  • Paved the way for electrically controlled spintronic devices utilizing FEAM.