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Stacking-Dependent Magnetism in Bilayer CrI3.

Nikhil Sivadas1, Satoshi Okamoto2, Xiaodong Xu3,4

  • 1School of Applied and Engineering Physics , Cornell University , Ithaca , New York 14853 , United States.

Nano Letters
|November 10, 2018
PubMed
Summary
This summary is machine-generated.

The stacking order of bilayer chromium triiodide (CrI3) dictates its magnetic properties, allowing tuning between antiferromagnetic and ferromagnetic states. This finding aids in understanding 2D magnet heterostructures.

Keywords:
2D magnetsCrI3Moiré superlatticesbeyond graphenestacking ordersuper-superexchange

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum magnetism

Background:

  • Bilayer chromium triiodide (CrI3) is a prominent two-dimensional (2D) magnet.
  • Understanding the relationship between structure and magnetism is crucial for designing novel magnetic devices.

Purpose of the Study:

  • To investigate the influence of stacking order on the magnetic properties of bilayer CrI3.
  • To explore methods for experimentally verifying stacking-dependent magnetism.

Main Methods:

  • Utilizing first-principles calculations to model bilayer CrI3.
  • Analyzing the interlayer exchange interaction as a function of stacking configuration.

Main Results:

  • The stacking order is identified as the primary determinant of the magnetic ground state in bilayer CrI3.
  • Tuning the interlayer stacking order allows control over the magnetic interaction, switching between antiferromagnetic and ferromagnetic states.
  • The linear magnetoelectric effect is proposed as a viable experimental technique to measure the predicted stacking-dependent magnetism.

Conclusions:

  • The stacking order critically influences the magnetic ground state of bilayer CrI3.
  • This work provides a theoretical explanation for the observed antiferromagnetism in bilayer CrI3.
  • The findings have significant implications for the development of heterostructures based on 2D magnets.