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Related Experiment Video

Updated: Jun 4, 2025

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Orbital Current Pumping From Ultrafast Light-driven Antiferromagnetic Insulator.

Lin Huang1,2, Da Tian3, Liyang Liao4

  • 1Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 21, 2024
PubMed
Summary

Researchers observed orbital current generation in antiferromagnets using orbital pumping in α-Fe2O3. This opens new avenues for antiferromagnetic orbitronics and spintronic applications.

Keywords:
THz emissionantiferromagnetic orbitronicsinverse orbital rashba‐edelstein effectorbital currentorbital pumping

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • The orbital Hall effect is crucial for spintronic applications, enabling orbital current generation in ferromagnetic materials.
  • Generating orbital currents in antiferromagnets has been a significant challenge in the field.

Purpose of the Study:

  • To experimentally demonstrate the generation of orbital currents in antiferromagnetic insulators.
  • To explore the phenomenon of orbital pumping in α-Fe2O3.
  • To investigate the role of heterostructures in enhancing orbital current generation.

Main Methods:

  • Utilizing terahertz (THz) emission spectroscopy to detect orbital currents.
  • Fabricating and analyzing α-Fe2O3/Pt/CuOₓ heterostructures.
  • Investigating magnetoresistance properties to understand interfacial effects.

Main Results:

  • Successfully observed orbital current generation from orbital dynamics in the antiferromagnetic insulator α-Fe2O3.
  • Observed a significant enhancement in THz signal in α-Fe2O3/Pt/CuOₓ heterostructures compared to α-Fe2O3/Pt.
  • Identified an optimal Pt thickness of 2 nm for maximum THz signal enhancement.
  • Attributed the enhancement to coupled spin-orbital currents and interfacial orbital contributions.

Conclusions:

  • This work provides the first experimental evidence of orbital current generation in antiferromagnets via orbital pumping.
  • The findings establish a platform for orbital-to-charge conversion in antiferromagnets.
  • This research opens the interdisciplinary field of antiferromagnetic orbitronics.