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Related Concept Videos

Ferromagnetism01:31

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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...
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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Fermi Level Dynamics01:12

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Alternating atomic-dipole layers and switching dynamics in Al1-xScxN ferroelectrics.

Yonghui Zheng1, Ruirong Bai1,2, Tianjiao Xin1

  • 1Key Laboratory of Polar Materials and Devices (MOE), School of Information and Electronic Engineering (School of Integrated Circuits Science and Engineering), East China Normal University, Shanghai, China.

Science (New York, N.Y.)
|July 2, 2026
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Summary

Aluminum Scandium Nitride (AlScN) ferroelectrics show great potential for electronics. Chemical ordering in AlScN reduces the switching energy barrier, enabling lower coercive fields and improved device performance.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Nanotechnology

Background:

  • Wurtzite Aluminum Scandium Nitride (AlScN) ferroelectrics offer high polarization and thermal stability.
  • Understanding the atomic-scale mechanisms behind reduced coercive fields in AlScN is crucial for advanced electronic applications.

Purpose of the Study:

  • To elucidate the atomic-scale mechanism of cation substitution in AlScN ferroelectrics.
  • To investigate how chemical ordering influences polarization switching energy barriers and coercive fields.

Main Methods:

  • Spherical aberration-corrected transmission electron microscopy (TEM) was employed.
  • In situ imaging techniques were utilized to observe polarization switching dynamics at the atomic level.

Main Results:

  • Periodic modulation of cation-anion spacing was observed, forming alternating atomic dipole layers.
  • Energetically favorable chemical ordering of Al and Sc atoms between layers was identified.
  • Atomic-scale, stepwise polarization switching with intermediate states and local spacing fluctuations was directly captured.
  • Compositional inhomogeneity in dipole layers was found to reduce the switching energy barrier.

Conclusions:

  • Atomic-scale dipole structures in AlScN are directly linked to polarization switching kinetics.
  • Chemical ordering and compositional inhomogeneity are key factors in reducing the coercive field.
  • These findings facilitate the rational design of high-performance wurtzite ferroelectrics.