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Researchers achieved a giant spin Hall effect (SHE) alongside ferromagnetism in MoTe2/WSe2 moiré bilayers. This breakthrough enables long-range spin transport and magnetism, crucial for advanced spintronics applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • The spin Hall effect (SHE) is vital for spintronics, generating spin currents via electrical current due to spin-orbit coupling.
  • Achieving large SHEs, long spin transport, and magnetism simultaneously in one material is a significant challenge.
  • Correlated magnetic materials typically exhibit weak SHEs.

Purpose of the Study:

  • To demonstrate a giant intrinsic spin Hall effect coexisting with ferromagnetism in a single material.
  • To explore the potential of moiré engineering for spintronics applications.
  • To investigate the conditions required for simultaneous large SHE and magnetism.

Main Methods:

  • Fabrication of AB-stacked MoTe2/WSe2 moiré bilayers.
  • Direct magneto-optical imaging to observe spin accumulation.
  • Application of moderate electrical currents (<1 A m⁻¹).
  • Gate voltage modulation to study electronic properties.

Main Results:

  • Demonstrated a giant intrinsic SHE coexisting with ferromagnetism in the moiré bilayers.
  • Observed significant spin accumulation on transverse edges under moderate currents.
  • Showcased long-range spin Hall transport and efficient non-local spin accumulation up to ~10 µm.
  • Found the giant SHE is linked to the interaction-driven Chern insulating state and quantum anomalous Hall breakdown.

Conclusions:

  • Moiré engineering of MoTe2/WSe2 bilayers enables simultaneous ferromagnetism and a giant spin Hall effect.
  • This system offers a promising platform for spintronics due to long-range spin transport.
  • The findings highlight the role of Berry curvature and electronic correlations in achieving advanced spintronic functionalities.