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Exploring altermagnetism in RuO2: from conflicting experiments to emerging consensus.
In Hyeok Choi1,2, Seung Gyo Jeong3, Bharat Jalan4
1Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
Nano Convergence
|January 28, 2026
Summary
Altermagnetism, a novel magnetic order, merges ferromagnet and antiferromagnet benefits. This review explores experimental methods for probing altermagnetism, focusing on the debated RuO2 material and the role of strain.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnetism is a new magnetic order combining properties of ferromagnets and antiferromagnets.
- Its unique spin structure and symmetry offer potential for advanced spintronic devices.
- Experimental verification of altermagnetism is crucial for its technological exploitation.
Purpose of the Study:
- To review experimental techniques for probing altermagnetism.
- To discuss recent studies on the altermagnetic candidate Ruthenium Dioxide (RuO2).
- To highlight the influence of strain on altermagnetic properties.
Main Methods:
- Overview of electronic, optical, and particle-based spectroscopies for altermagnetism detection.
- Analysis of experimental results on RuO2, categorized by technique.
- Examination of studies focusing on strained RuO2 thin films.
Main Results:
- Conflicting experimental results exist regarding the altermagnetic state of RuO2.
- Strain engineering in RuO2 thin films significantly impacts the emergence of altermagnetism.
- Various spectroscopic methods provide complementary insights into altermagnetic phenomena.
Conclusions:
- This review offers guidelines for investigating altermagnetic systems.
- It aims to contribute to resolving controversies surrounding RuO2's altermagnetism.
- Understanding strain effects is key for realizing altermagnetic spintronics.
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