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Magnetoelectric Coupling in Multiferroic Bilayer VS_{2}.

Xingen Liu1,2, Alexander P Pyatakov3, Wei Ren1,2

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

Physical Review Letters
|January 7, 2021
PubMed
Summary
This summary is machine-generated.

We discovered magnetoelectric coupling in bilayer VS_{2}, enabling electric field control of magnetism. This two-dimensional multiferroic material exhibits tunable magnetic properties through structural and electric field manipulation.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Multiferroic materials exhibiting magnetoelectric coupling are crucial for advanced electronic devices.
  • Two-dimensional materials offer unique properties due to their reduced dimensionality.
  • Vanadium disulfide (VS_{2}) bilayers present a promising platform for exploring novel multiferroic phenomena.

Purpose of the Study:

  • To investigate the magnetoelectric coupling effect in two-dimensional multiferroic bilayer VS_{2}.
  • To understand the relationship between ferroelectricity, antiferromagnetism, and structural properties.
  • To explore the potential for electronic control of magnetism in this material.

Main Methods:

  • First-principles calculations were employed to predict and analyze the material's properties.
  • The study focused on the ground-state 3R-type stacking of VS_{2} bilayers.
  • Analysis included investigation of symmetry breaking, polarization reversal, magnetic ordering, and magnetoelectric coupling mechanisms.

Main Results:

  • The 3R-type stacking of bilayer VS_{2} breaks space inversion symmetry, leading to perpendicular spontaneous polarization.
  • Ferroelectric polarization can be reversed via interlayer sliding.
  • Antiferromagnetic ordering within layers couples with ferroelectricity via a ferrovalley, enabling electronic control of magnetism.
  • Reducing interlayer distance generates a net magnetic moment.
  • Linear and second-order nonlinear magnetoelectric coupling were observed under an electric field.

Conclusions:

  • Bilayer VS_{2} exhibits significant magnetoelectric coupling effects, making it a promising two-dimensional multiferroic material.
  • The interplay between ferroelectricity, antiferromagnetism, and structural configurations allows for electric field control of magnetic properties.
  • This discovery opens avenues for designing novel spintronic and memory devices based on van der Waals heterostructures.