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Related Concept Videos

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...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
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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Updated: May 31, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Switchable Altermagnetism Induced by Polyhedral Rotation Distortion.

Yu Xie1, Yifei Hao1, Dinghui Wang1

  • 1School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China.

Nano Letters
|May 29, 2026
PubMed
Summary
This summary is machine-generated.

Altermagnetism, combining ferromagnet and antiferromagnet properties, is induced by polyhedral rotation distortion. This strain-tunable mechanism offers control over spin splitting for nanoscale spintronics.

Keywords:
spin splittingsymmetry analysistight-binding modeltwo-dimensional altermagnets

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism offers unique properties, merging ferromagnet spin splitting with antiferromagnet stray-field immunity.
  • Achieving altermagnetism through universal, strain-tunable structural geometry is a significant challenge.

Purpose of the Study:

  • To introduce and demonstrate a novel mechanism for inducing altermagnetism using polyhedral rotation distortion.
  • To explore the strain-tunability and control of spin splitting in altermagnetic materials.

Main Methods:

  • Theoretical investigation of symmetry breaking via cooperative polyhedral rotations.
  • Validation in two-dimensional MnX2 (X = O, S, Se, Te) monolayers.
  • Analysis of strain effects, including phase transitions.

Main Results:

  • Cooperative polyhedral rotations selectively break spin degeneracy while preserving altermagnetism symmetry.
  • Spin splitting sign is deterministically coupled to rotation distortion direction.
  • Significant strain-tuning observed in MnX2 monolayers, enabling reversible phase transitions.

Conclusions:

  • Polyhedral rotation is established as a viable design strategy for inducing altermagnetism.
  • This provides a versatile platform for developing strain-controlled nanoscale spintronic devices.
  • The findings pave the way for novel applications in advanced magnetic technologies.