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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.