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Realizing Abundant Two-Dimensional Altermagnets with Anisotropic Spin Current Via Spatial Inversion Symmetry Breaking
Chao Liu1, Xiangyang Li2, Xingxing Li1,3,4
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nano Letters
|May 27, 2025
Summary
Researchers developed a new method to create altermagnets, which are materials for advanced spintronic devices. Breaking crystal symmetry in 2D materials like FeSe and Mn2PSe monolayers yields these promising altermagnets.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnets offer unique spin properties for spintronic applications.
- Developing general design strategies for low-dimensional altermagnets is crucial.
- Existing methods for altermagnet design are limited.
Purpose of the Study:
- To propose a general method for designing altermagnets in low dimensions.
- To identify novel polar altermagnets using first-principles calculations.
- To elucidate the mechanism behind altermagnetism induced by broken inversion symmetry.
Main Methods:
- First-principles calculations were employed to investigate material properties.
- Janus structurization was applied to two-dimensional (2D) FeSe-type monolayers.
- Systematic screening was performed to identify promising altermagnetic candidates.
Main Results:
- Identified 41 polar altermagnets from Janus-structured 2D FeSe-type monolayers.
- Discovered 29 altermagnets with significant spin splitting (>0.5 eV) and high Néel temperatures (>77 K).
- Demonstrated anisotropic spin current generation and spin Hall effect in 2D Mn2PSe.
Conclusions:
- Breaking spatial inversion symmetry in antiferromagnetic monolayers is a viable route to altermagnetism.
- The proposed Janus structurization method enables the design of multifunctional nanoaltermagnets.
- This work provides a pathway for realizing high-performance spintronic devices.
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