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Electrical Manipulation of Magnon Diffusion Length in Pt/YIG Three-Terminal Devices.

Geunwoo Kim1, Takayuki Shiino1, Geun-Hee Lee2

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Researchers demonstrate electrical control over magnon diffusion length in spintronic devices. This breakthrough allows tuning magnon behavior using electrical currents, crucial for developing energy-efficient magnonic technologies.

Keywords:
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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Magnons are fundamental to spintronics, enabling spin angular momentum transport without charge current.
  • Energy-efficient spintronic devices rely on magnons, but electrical control over their diffusion length remains a challenge.
  • Previous work focused on magnon generation, manipulation, and detection, but not electrical tuning of diffusion length.

Purpose of the Study:

  • To demonstrate the electrical control of magnon diffusion length (λm) in a three-terminal device.
  • To investigate the dependence of λm modulation on injection current (Iinj) and modulation current density.
  • To explore the underlying physics, including the role of subthermal magnons and spin-orbit torque.

Main Methods:

  • Fabrication and characterization of three-terminal Platinum/Yttrium Iron Garnet (Pt/YIG) devices.
  • Systematic variation of injector-to-detector distance and modulator widths.
  • Application of varying modulation currents and injection currents to study their effects on λm.

Main Results:

  • Successful electrical control of magnon diffusion length (λm) was achieved in Pt/YIG devices.
  • λm was effectively tuned by the modulation current, showing a strong dependence on injection current (Iinj).
  • At low Iinj, λm increased from 0.84 to 1.8 μm with a modulation current density of 5.5 × 10^7 A/cm^2.
  • Modulation efficiency improved at higher Iinj due to subthermal magnon overpopulation and enhanced spin-orbit torque.

Conclusions:

  • Electrical manipulation of magnon diffusion length is feasible using three-terminal devices.
  • The findings pave the way for practical magnonic devices with tunable magnon properties.
  • This work opens new avenues for designing energy-efficient spintronic applications.