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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Nonlocal Uniform-Mode Ferromagnetic Resonance Spin Pumping.

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Summary

Researchers developed a new method for nonlocal spin injection using ferromagnetic resonance spin pumping in platinum/yttrium iron garnet structures. This technique allows for efficient spin transport in spintronic devices at room temperature.

Keywords:
ferrimagnetic insulatorsinverse spin Hall effectnonlocal spin pumpingspin current

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • Nonlocal spin transport is crucial for advancing spintronic devices.
  • Conventional methods often rely on ferromagnetic or heavy metal electrodes for spin current generation and detection.
  • Developing efficient and distinct spin injection schemes is an ongoing challenge.

Purpose of the Study:

  • To introduce and demonstrate a novel nonlocal spin injection scheme.
  • To utilize uniform-mode ferromagnetic resonance (FMR) spin pumping in platinum/yttrium iron garnet (YIG) lateral structures.
  • To enable clearly distinguishable local and nonlocal spin pumping signals.

Main Methods:

  • Fabrication of Pt/YIG lateral structures.
  • Utilizing uniform-mode ferromagnetic resonance (FMR) spin pumping.
  • Exploiting the distinct resonant fields of Pt/YIG and bare YIG due to Pt-induced anisotropy changes.
  • Measuring spin transport properties.

Main Results:

  • Successfully implemented a new nonlocal spin injection scheme.
  • Achieved clearly distinguishable local and nonlocal spin pumping signals.
  • Determined the spin decay length of nonlocal uniform-mode spin pumping in 20 nm YIG films to be 2.1 μm at room temperature.

Conclusions:

  • The developed FMR spin pumping scheme offers a viable route for nonlocal spin injection.
  • The distinct resonant fields facilitate precise control and detection of spin currents.
  • This method holds promise for future spintronic device applications requiring efficient spin transport.