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Efficient Spin-to-Charge Conversion via Altermagnetic Spin Splitting Effect in Antiferromagnet RuO_{2}
1Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Physical Review Letters
|June 9, 2023
Summary
Researchers demonstrate spin-to-charge conversion in ruthenium dioxide using the altermagnetic spin splitting effect (ASSE). This finding enables efficient electrical detection of spin currents, advancing altermagnetism and spin detection technologies.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Materials Science
Background:
- Relativistic spin Hall effects facilitate spin current generation and detection.
- Nonrelativistic altermagnetic spin splitting effect (ASSE) in RuO2 generates controllable spin currents.
- Electrical detection of spin current via ASSE remains a challenge.
Purpose of the Study:
- To demonstrate and investigate the inverse altermagnetic spin splitting effect (ASSE) for spin-to-charge conversion in RuO2.
- To explore the mechanism of spin-to-charge conversion distinct from conventional effects.
- To advance the understanding and application of altermagnetism in spintronics.
Main Methods:
- Utilized spin Seebeck effect measurements.
- Investigated spin-to-charge conversion in the antiferromagnet RuO2.
- Analyzed crystal axes-dependent conversion efficiency.
Main Results:
- Successfully demonstrated spin-to-charge conversion stemming from ASSE in RuO2.
- Observed spin Seebeck voltage detection irrespective of spin polarization direction relative to voltage channel or thermal gradient.
- Confirmed conversion of both x- and z-spin polarizations into charge current.
- Distinguished the observed conversion from magnetic and antiferromagnetic inverse spin Hall effects.
Conclusions:
- The study establishes the electrical detection of spin current via ASSE in RuO2.
- The findings highlight the unique nature of spin-to-charge conversion in altermagnets.
- This research offers a new avenue for spin detection technologies and altermagnetism studies.
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