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Designing Spin Symmetry for Altermagnetism with Strong Magnetoelectric Coupling
Wei Sun1, Wenxuan Wang2, Changhong Yang1
1Shandong Provincial Key Laboratory of Green and Intelligent Building Materials, University of Jinan, Jinan, 250022, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 17, 2025
Summary
Researchers discovered a new way to create altermagnets by changing spin-space symmetry, not real-space symmetry. This method enhances spin splitting and enables novel magnetoelectric coupling for spintronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnets are collinear magnets with zero net magnetization and symmetry-dictated spin polarization.
- Conventional methods to induce altermagnetism focus on real-space symmetry manipulation.
- Altermagnets are promising for next-generation spintronic devices.
Purpose of the Study:
- To introduce a novel and general approach for achieving altermagnetism by modulating spin-space symmetry.
- To uncover the microscopic origin of altermagnetism driven by spin-space symmetry.
- To identify the mechanism for enhanced spin splitting in altermagnets.
Main Methods:
- Tight-binding models
- First-principles calculations
- Magneto-optical Kerr effect measurements
Main Results:
- A new method to achieve altermagnetism via spin-space symmetry modulation was developed.
- The microscopic origin of altermagnetism and enhanced spin splitting was elucidated.
- A novel spin symmetry-dependent magnetoelectric coupling mechanism, distinct from multiferroics, was demonstrated.
Conclusions:
- Spin-space symmetry modulation offers a general route to altermagnetism.
- This approach enables unique magnetoelectric coupling with ferroelectricity.
- The findings provide a theoretical basis for advanced spintronic devices.
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