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Area of Science:

  • Spintronics and material science
  • Condensed matter physics

Background:

  • Efficient spin current transmission is crucial for spintronics.
  • Gadolinium gallium garnet (GGG) is an electric insulator and common substrate, not previously recognized for spin transport capabilities.

Purpose of the Study:

  • To investigate spin current propagation in paramagnetic Gadolinium gallium garnet (GGG).
  • To determine the spin transport properties of GGG and compare them to existing materials.

Main Methods:

  • Experimental measurement of spin current propagation in GGG.
  • Characterization of spin diffusion length and spin conductivity at low temperatures and high magnetic fields.

Main Results:

  • Spin current propagation was observed in paramagnetic GGG over several microns.
  • Spin transport persisted up to 100 K, well above the magnetic glass-like transition temperature.
  • GGG exhibited a spin diffusion length of 1.8 ± 0.2 μm and spin conductivity of (7.3 ± 0.3) × 10⁴ Sm⁻¹ at 5 K and 3.5 T, surpassing that of YIG.

Conclusions:

  • Efficient spin transport does not necessitate exchange stiffness, challenging conventional spintronics models.
  • Paramagnetic GGG is a superior spin current conduit, offering new material design strategies for spintronic devices.