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Reversible Spin Splitting Effect in Altermagnetic RuO2 Thin Films.

Hyeonjung Jung1, Gimok So2, Seunghyeon Noh1

  • 1Department of Materials and Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.

Nano Letters
|November 25, 2025
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Summary
This summary is machine-generated.

We demonstrate reversible inverse altermagnetic spin splitting effect (IASSE) in RuO2 thin films. IASSE

Keywords:
Néel vectoraltermagnetaltermagnetic spin splitting effectspin Hall effectspin Seebeck effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnets exhibit spin-dependent anisotropic Fermi surfaces.
  • Altermagnetic spin splitting effect (ASSE) enables nonrelativistic spin-charge conversion.
  • The inverse ASSE (IASSE) and its relation to the spin Hall effect (SHE) in RuO2 thin films are debated.

Purpose of the Study:

  • To demonstrate reversible IASSE in RuO2 thin films.
  • To investigate the influence of Néel vector orientation on IASSE.
  • To clarify the magnitude and sign of IASSE relative to SHE.

Main Methods:

  • Fabrication of CoFeB/RuO2 heterostructures.
  • Spin Seebeck measurements to probe spin-charge conversion (SCC).
  • Control of Néel vector orientation in RuO2 thin films.

Main Results:

  • Reversible IASSE was demonstrated by controlling the Néel vector orientation.
  • IASSE-induced SCC polarity reversal was observed upon Néel vector switching.
  • IASSE was shown to either enhance or suppress SCC depending on Néel orientation.

Conclusions:

  • IASSE in RuO2 is symmetry-governed and directionally reversible.
  • The findings clarify the controversial aspects of IASSE in altermagnetic materials.
  • This work provides a pathway for utilizing IASSE in spintronic devices.