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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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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,...
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Related Experiment Video

Updated: Jul 7, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Multipiezo Effect in Altermagnetic V2SeTeO Monolayer.

Yu Zhu1, Taikang Chen1, Yongchang Li1

  • 1Department of Physics, Shanghai Key Laboratory of High Temperature Superconductors, International Centre of Quantum and Molecular Structures, Shanghai University, Shanghai 200444, China.

Nano Letters
|December 26, 2023
PubMed
Summary
This summary is machine-generated.

We discovered a new material, Janus monolayer V2SeTeO, exhibiting a "multipiezo" effect. This strain-engineered quantum material shows enhanced valley polarization and magnetization for advanced electronic applications.

Keywords:
AltermagneticJanus monolayerMultipiezo effectStrain engineering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Strain engineering is key for tuning quantum material properties.
  • Piezo effects arise from disciplined strain responses in nanosystems.
  • Theoretical work predicted piezomagnetism and valley polarization in V2Se2O.

Purpose of the Study:

  • To predict and investigate the properties of a novel altermagnetic Janus monolayer, V2SeTeO.
  • To explore the potential of V2SeTeO for multifunctional electronic applications.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • Theoretical prediction and characterization of V2SeTeO properties.

Main Results:

  • A stable altermagnetic Janus monolayer, V2SeTeO, was predicted.
  • V2SeTeO exhibits a novel "multipiezo" effect, combining piezoelectricity, piezovalley, and piezomagnetism.
  • The material shows enhanced valley polarization and net magnetization under strain compared to V2Se2O, with a large piezoelectric coefficient.

Conclusions:

  • The "multipiezo" effect in V2SeTeO offers significant potential.
  • Janus monolayer V2SeTeO is a promising candidate for nanoelectronics, optoelectronics, spintronics, and valleytronics.