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Spin Demons in d-Wave Altermagnets
Pieter M Gunnink1, Jairo Sinova1, Alexander Mook1
1Johannes Gutenberg University Mainz, Staudingerweg 7, Mainz 55128, Germany.
Physical Review Letters
|October 5, 2025
Summary
Researchers discovered a novel phenomenon called a spin demon in d-wave altermagnets. This spin demon, an underdamped excitation, exhibits unique magnetic properties and exists in both 2D and 3D materials.
Area of Science:
- Condensed matter physics
- Quantum magnetism
Background:
- Plasmons involve out-of-phase electron oscillations.
- Altermagnets are a new class of collinear magnetic materials.
Purpose of the Study:
- To investigate the existence and properties of spin demons in d-wave altermagnets.
- To explore the nature of spin excitations in these materials.
Main Methods:
- Theoretical analysis of d-wave altermagnet systems.
- Investigating electron band structures and spin dynamics.
Main Results:
- D-wave altermagnets naturally host a spin demon.
- The spin demon is an underdamped excitation with quality factors >10.
- The spin demon carries a magnetic moment with d-wave symmetry.
Conclusions:
- Spin demons are a new type of excitation in d-wave altermagnets.
- These phenomena are robust and exist in both 2D and 3D.
- This discovery opens new avenues for exploring spin dynamics in magnetic materials.
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