Related Experiment Video
Updated: Oct 14, 2025
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Magnetism and Its Structural Coupling Effects in 2D Ising Ferromagnetic Insulator VI3
Zhong Lin1, Bevin Huang1, Kyle Hwangbo1
1Department of Physics, University of Washington, Seattle, Washington 98195, United States.
Nano Letters
|November 2, 2021
Summary
Vanadium triiodide (VI3) thin films exhibit robust ferromagnetism, with Curie temperature increasing in thinner layers. This suggests coupled magnetic and structural properties in van der Waals magnets.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Van der Waals (vdW) magnets offer tunable platforms for studying layer-dependent magnetic phenomena.
- Vanadium triiodide (VI3) is a layered ferromagnetic Mott insulator in bulk form.
Purpose of the Study:
- To investigate the thickness-dependent magnetism of VI3.
- To explore the relationship between magnetic and structural properties in VI3.
Main Methods:
- Magnetic circular dichroism microscopy to probe magnetism.
- Second harmonic generation measurements to detect broken inversion symmetry.
Main Results:
- Robust ferromagnetism observed down to the monolayer limit with large coercive fields.
- Anomalous increase in Curie temperature with decreasing layer number, reaching 60 K in monolayers.
- Broken inversion symmetry detected in exfoliated VI3 flakes (down to trilayers), indicating altered layer stacking.
Conclusions:
- Exfoliated VI3 flakes exhibit unique magnetic properties distinct from the bulk.
- A coupling between magnetic and structural degrees of freedom is suggested in VI3.
- VI3 holds potential for engineering layer and twist angle-dependent magnetic phenomena.
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