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Scientific article
Open access
English

Low-temperature monoclinic layer stacking in atomically thin CrI3 crystals

Published in2D Materials, vol. 7, no. 1, 015007
Publication date2020
Abstract

Chromium triiodide, CrI3, is emerging as a promising magnetic two-dimensional semiconductor where spins are ferromagnetically aligned within a single layer. Potential applications in spintronics arise from an antiferromagnetic ordering between adjacent layers that gives rise to spin filtering and a large magnetoresistance in tunnelling devices. This key feature appears only in thin multilayers and it is not inherited from bulk crystals, where instead neighbouring layers share the same ferromagnetic spin orientation. This discrepancy between bulk and thin samples is unexpected, as magnetic ordering between layers arises from exchange interactions that are local in nature and should not depend strongly on thickness. Here we solve this controversy and show through polarization resolved Raman spectroscopy that thin multilayers do not undergo a structural phase transition typical of bulk crystals. As a consequence, a different stacking pattern is present in thin and bulk samples at the temperatures at which magnetism sets in and, according to previous first-principles simulations, this results in a different interlayer magnetic ordering. Our experimental findings provide evidence for the strong interplay between stacking order and magnetism in CrI3, opening interesting perspectives to design the magnetic state of van der Waals multilayers.

Keywords
  • 2D materials
  • 2D magnetism
  • Raman spectroscopy
  • CrI3
Funding
  • Swiss National Science Foundation - Ambizione, Division II
  • Autre - Graphene Flagship
Citation (ISO format)
UBRIG, Nicolas et al. Low-temperature monoclinic layer stacking in atomically thin CrI<sub>3</sub> crystals. In: 2D Materials, 2020, vol. 7, n° 1, p. 015007. doi: 10.1088/2053-1583/ab4c64
Main files (2)
Article (Accepted version)
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Article (Published version)
Identifiers
ISSN of the journal2053-1583
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