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Electrical manipulation of spin splitting torque in altermagnetic RuO2
Yichi Zhang1,2, Hua Bai1, Jiankun Dai1
1Key Laboratory of Advanced Materials (Ministry of Education), School of Materials Science and Engineering, Tsinghua University, Beijing, China.
Nature Communications
|July 2, 2025
Summary
Altermagnets generate spin splitting torque (SST) via the altermagnetic spin splitting effect (ASSE). Researchers demonstrate electrical control of SST in RuO2, enabling new spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnets exhibit unique spin properties due to the nonrelativistic altermagnetic spin splitting effect (ASSE).
- Altermagnetic spin splitting effect generates time-reversal-odd spin current and spin splitting torque (SST) with spin polarization parallel to the Néel vector.
- Effective manipulation of SST is crucial for developing advanced spintronic devices.
Purpose of the Study:
- To achieve electrical control of SST in altermagnetic Ruthenium Dioxide (RuO2).
- To demonstrate the Néel vector-dependent generation of SST in RuO2.
- To explore the potential of RuO2 for high-speed memory and nano-oscillator applications.
Main Methods:
- Utilizing electrical transport measurements to observe current-induced effects.
- Employing X-ray magnetic linear dichroism (XMLD) measurements to characterize the Néel vector.
- Investigating spin-orbit torque for Néel vector switching in RuO2 films.
Main Results:
- Demonstrated electrical control of SST in altermagnetic RuO2.
- Showcased current-induced switching of the Néel vector along the current direction.
- Observed enhanced spin polarization parallel to the Néel vector, leading to stronger ASSE-induced spin current.
Conclusions:
- Findings enrich the understanding of altermagnet properties and ASSE.
- Pave the way for highly controllable and efficient spintronic devices like high-speed memories and nano-oscillators.
- Highlight the potential of RuO2 as a key material in next-generation spintronics.
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