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Enhancement of interlayer exchange in an ultrathin two-dimensional magnet

Journal Article · · Nature Physics
 [1];  [1];  [1];  [2];  [2];  [3];  [4];  [3];  [2];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Harvard Univ., Cambridge, MA (United States)
  3. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  4. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Universidade Federal do ABC, Santo André (Brazil)
Following the recent isolation of monolayer CrI3, many more two-dimensional van der Waals magnetic materials have been isolated. Their incorporation in van der Waals heterostructures offers a new platform for spintronics, proximity magnetism and quantum spin liquids. A primary question in this field is how exfoliating crystals to the few-layer limit influences their magnetism. Studies of CrI3 have shown a different magnetic ground state for ultrathin exfoliated films compared with the bulk, but the origin is not yet understood. Here, we use electron tunnelling through few-layer crystals of the layered antiferromagnetic insulator CrCl3 to probe its magnetic order and find a tenfold enhancement of the interlayer exchange compared with bulk crystals. Moreover, temperature- and polarization-dependent Raman spectroscopy reveals that the crystallographic phase transition of bulk crystals does not occur in exfoliated films. This results in a different low-temperature stacking order and, we hypothesize, increased interlayer exchange. In conclusion, our study provides insight into the connection between stacking order and interlayer interactions in two-dimensional magnets, which may be relevant for correlating stacking faults and mechanical deformations with the magnetic ground states of other more exotic layered magnets such as RuCl3.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
Alfred P. Sloan Foundation; Gordon and Betty Moore Foundation; National Science Foundation (NSF); US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; SC0018935
OSTI ID:
1562529
Alternate ID(s):
OSTI ID: 1798973
Report Number(s):
IS--J-0,097; IS--J-9986
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 12 Vol. 15; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Van der Waals magnets: Wonder building blocks for two‐dimensional spintronics? journal October 2019
Switching 2D magnetic states via pressure tuning of layer stacking journal October 2019
Determining the phase diagram of atomically thin layered antiferromagnet CrCl3 journal November 2019
The phase diagram of 2D antiferromagnets journal December 2019
Tuning inelastic light scattering via symmetry control in the two-dimensional magnet CrI3 journal January 2020
Probing and controlling magnetic states in 2D layered magnetic materials journal September 2019
Two-dimensional van der Waals spinterfaces and magnetic-interfaces journal March 2020
High mobility in a van der Waals layered antiferromagnetic metal journal February 2020

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