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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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Updated: Feb 6, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Van der Waals Spin Valves.

C Cardoso1, D Soriano1, N A García-Martínez1

  • 1QuantaLab, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre José Veiga, 4715-330 Braga, Portugal.

Physical Review Letters
|August 25, 2018
PubMed
Summary
This summary is machine-generated.

We propose novel spin valves using ferromagnetic insulators sandwiching a 2D conductor. The magnetization alignment controls the conductor's conductivity, opening a band gap in the antiparallel configuration.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin valves are crucial in spintronics for controlling electrical resistance via magnetic alignment.
  • Ferromagnetic insulators offer unique properties for spintronic devices, but their integration with 2D materials is complex.

Purpose of the Study:

  • To investigate the impact of ferromagnetic insulator magnetization orientation on the conductivity of an intercalated 2D nonmagnetic conductor.
  • To explore the potential of novel spin valve architectures for controlling electronic properties.

Main Methods:

  • Theoretical modeling using a tight-binding model for a graphene bilayer between ferromagnetic insulators.
  • First-principles calculations employing density functional theory (DFT) for graphene bilayer with CrI3 ferromagnetic insulator monolayers.

Main Results:

  • The tight-binding model demonstrated that antiparallel magnetization opens a band gap at the Dirac point in graphene, while parallel magnetization maintains conductivity.
  • DFT calculations confirmed these findings, showing a band gap opening specifically in the antiparallel configuration for graphene between CrI3.

Conclusions:

  • The relative orientation of ferromagnetic insulator magnetizations significantly influences the in-plane conductivity of intercalated 2D conductors.
  • This study validates a new spin valve design where magnetic alignment controls the electronic band structure of 2D materials.