Polarization-resolved Raman spectroscopy shows that atomically thin CrI3 remains in the monoclinic stacking phase at low temperature, unlike bulk CrI3, explaining the antiferromagnetic order in thin multilayers.
Direct observation of van der Waals stacking dependent interlayer magnetism
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abstract
Controlling the crystal structure is a powerful approach for manipulating the fundamental properties of solids. Unique to two-dimensional (2D) van der Waals materials, the control can be achieved by modifying the stacking order through rotation and translation between the layers. Here, we report the first observation of stacking dependent interlayer magnetism in the 2D magnetic semiconductor, chromium tribromide (CrBr3), enabled by the successful growth of its monolayer and bilayer through molecular beam epitaxy. Using in situ spin-polarized scanning tunneling microscopy and spectroscopy, we directly correlated the atomic lattice structure with observed magnetic order. We demonstrated that while individual CrBr3 monolayer is ferromagnetic, the interlayer coupling in bilayer depends strongly on the stacking order and can be either ferromagnetic or antiferromagnetic. Our observations provide direct experimental evidence for exploring the stacking dependent layered magnetism, and pave the way for manipulating 2D magnetism with unique layer twist angle control.
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cond-mat.mes-hall 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Low-temperature monoclinic layer stacking in atomically thin CrI$_3$ crystals
Polarization-resolved Raman spectroscopy shows that atomically thin CrI3 remains in the monoclinic stacking phase at low temperature, unlike bulk CrI3, explaining the antiferromagnetic order in thin multilayers.