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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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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.
A magnetic field is defined by the force that a charged particle experiences...
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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.
The vector...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Magnetostatic Boundary Conditions01:28

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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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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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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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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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Cross-State Alternating Magnetism in Two-Dimensional Systems.

Xiaokai Chen1, Xiaoyu Xuan1, Wanlin Guo1

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, and Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing 210016, China.

Nano Letters
|December 19, 2025
PubMed
Summary
This summary is machine-generated.

We introduce cross-state alternating magnetism (cs-AM), a novel phenomenon enabling spin polarization control by switching between material states. This discovery opens new avenues for spintronic devices by manipulating magnetism through electric polarization.

Keywords:
antiferromagnetic spin polarizationcross-state alternating magnetismmultistate spintronicssymmetry relation

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism exhibits alternating spin polarizations in real and reciprocal spaces within a single material state.
  • Existing control methods for spin polarization are limited, necessitating new approaches for advanced spintronic applications.

Purpose of the Study:

  • To propose and theoretically validate a new concept, cross-state alternating magnetism (cs-AM), for manipulating spin polarization.
  • To explore the feasibility of switching spin polarizations by transitioning between equivalent material states in 2D systems.

Main Methods:

  • Symmetry analysis to develop the theory for cs-AM.
  • Tight-binding model simulations to validate the state transition mechanism.
  • Ab initio calculations to demonstrate cs-AM in specific material systems.

Main Results:

  • Demonstrated that state transitions, triggered by electric polarization flipping, can switch spin polarizations in altermagnets and ferrimagnets.
  • Identified half-metallic cs-AM in Lu3N2O2 bilayers via interlayer sliding.
  • Revealed a spin-valley locked altermagnetic state in Cr2SeO bilayers under an electric field.

Conclusions:

  • Cross-state alternating magnetism (cs-AM) offers a new paradigm for controlling spin polarization by leveraging material state changes.
  • The proposed theory and demonstrated examples highlight the potential for realizing novel spintronic functionalities.
  • The framework can be extended for cascaded manipulation of spin polarizations through combined stimuli like stacking and ferroelectricity.