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Multiple antiferromagnetic phases and magnetic anisotropy in exfoliated CrBr3 multilayers
Fengrui Yao1,2, Volodymyr Multian3,4,5, Zhe Wang6
1Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211, Geneva, Switzerland. fengrui.yao@unige.ch.
Nature Communications
|August 17, 2023
Summary
Researchers discovered three magnetic phases in twisted chromium tribromide (CrBr3) multilayers. This finding, enabled by lower anisotropy than chromium triiodide (CrI3), establishes CrBr3 as a promising material for creating non-collinear magnetic phases.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Twisted 2D magnets exhibit stacking-dependent magnetic exchange interactions.
- Chromium triiodide (CrI3) shows ferromagnetic or antiferromagnetic order but its strong anisotropy hinders non-collinear phases.
Purpose of the Study:
- To experimentally observe and characterize magnetic phases in twisted chromium tribromide (CrBr3) multilayers.
- To investigate the role of anisotropy in forming non-collinear magnetic textures.
- To establish CrBr3 as a model system for deterministic creation of exotic magnetic phases.
Main Methods:
- Magnetoconductance measurements on CrBr3 tunnel barriers.
- Raman spectroscopy.
- Density functional theory (DFT) calculations.
Main Results:
- Observation of three distinct magnetic phases (one ferromagnetic, two antiferromagnetic) in exfoliated CrBr3 multilayers.
- CrBr3 exhibits significantly smaller uniaxial anisotropy compared to CrI3.
- Identification of stackings responsible for different interlayer magnetic couplings.
- Experimental detection of all predicted locally stable magnetic states in CrBr3.
Conclusions:
- Twisted bilayer CrBr3 is an ideal system for deterministically creating non-collinear magnetic phases due to its tunable interlayer exchange energy.
- The study provides complete information on stacking-dependent interlayer exchange energy in CrBr3.
- Experimental results show excellent agreement with DFT predictions.
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