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Two-Dimensional van der Waals Nanoplatelets with Robust Ferromagnetism.

Michael C De Siena1, Sidney E Creutz1, Annie Regan1

  • 1Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.

Nano Letters
|February 8, 2020
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Summary

Researchers created nanoscale ferromagnetic platelets of chromium triiodide (CrI3), a 2D van der Waals material. These tiny structures exhibit strong magnetic properties, paving the way for smaller spintronics devices.

Keywords:
Two-dimensional materialscolloidalferromagnetismnanocrystalsvan der Waals

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) van der Waals (vdW) materials offer unique physical properties due to their reduced dimensionality.
  • Ferromagnetism in 2D materials is crucial for next-generation spintronics, but realizing it in lateral nanostructures remains challenging.

Purpose of the Study:

  • To synthesize and characterize colloidal nanoplatelets of the 2D van der Waals ferromagnet chromium triiodide (CrI3).
  • To investigate the magnetic properties and ferromagnetic ordering of these CrI3 nanoplatelets at the nanoscale.
  • To explore the potential of these nanostructures for spintronics applications.

Main Methods:

  • Synthesis of colloidal nanoplatelets of CrI3 with controlled lateral dimensions (∼25 nm) and thickness (∼4 nm).
  • Structural characterization of the nanoplatelets.
  • Magnetic characterization using magnetometry.
  • Magneto-optical characterization using magnetic circular dichroism (MCD) spectroscopy.

Main Results:

  • Successfully synthesized CrI3 nanoplatelets corresponding to a few monolayers.
  • Demonstrated robust 2D ferromagnetic ordering with Curie temperatures comparable to bulk CrI3.
  • Observed magnetization steps related to concerted spin-reversal of individual layers, similar to larger 2D sheets.
  • Extended findings to CrBr3 and Cr(I1-xBrx)3 nanoplatelets.

Conclusions:

  • These results represent the first lateral nanostructures of 2D van der Waals ferromagnets.
  • Robust ferromagnetism is achievable in CrI3 nanoplatelets at nanometer lateral dimensions.
  • This work opens new avenues for miniaturization in spintronics devices utilizing 2D van der Waals ferromagnets.