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Spin transport in insulators without exchange stiffness

Author

Listed:
  • Koichi Oyanagi

    (Tohoku University)

  • Saburo Takahashi

    (Tohoku University
    Tohoku University
    Tohoku University)

  • Ludo J. Cornelissen

    (University of Groningen)

  • Juan Shan

    (University of Groningen)

  • Shunsuke Daimon

    (Tohoku University
    Tohoku University
    The University of Tokyo)

  • Takashi Kikkawa

    (Tohoku University
    Tohoku University)

  • Gerrit E. W. Bauer

    (Tohoku University
    Tohoku University
    Tohoku University
    University of Groningen)

  • Bart J. van Wees

    (University of Groningen)

  • Eiji Saitoh

    (Tohoku University
    Tohoku University
    Tohoku University
    The University of Tokyo)

Abstract

The discovery of new materials that efficiently transmit spin currents has been important for spintronics and material science. The electric insulator Gd3Ga5O12 (GGG), a standard substrate for growing magnetic films, can be a spin current generator, but has never been considered as a superior conduit for spin currents. Here we report spin current propagation in paramagnetic GGG over several microns. Surprisingly, spin transport persists up to temperatures of 100 K $$\gg$$ ≫ Tg = 180 mK, the magnetic glass-like transition temperature of GGG. At 5 K and 3.5 T, we find a spin diffusion length λGGG = 1.8 ± 0.2 μm and a spin conductivity σGGG = (7.3 ± 0.3) × 104 Sm−1 that is larger than that of the record quality magnet Y3Fe5O12 (YIG). We conclude that exchange stiffness is not required for efficient spin transport, which challenges conventional models and provides new material-design strategies for spintronic devices.

Suggested Citation

  • Koichi Oyanagi & Saburo Takahashi & Ludo J. Cornelissen & Juan Shan & Shunsuke Daimon & Takashi Kikkawa & Gerrit E. W. Bauer & Bart J. van Wees & Eiji Saitoh, 2019. "Spin transport in insulators without exchange stiffness," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12749-7
    DOI: 10.1038/s41467-019-12749-7
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    Cited by:

    1. Wang, Sicheng & Noland, Robert B., 2021. "What is the elasticity of sharing a ridesourcing trip?," Transportation Research Part A: Policy and Practice, Elsevier, vol. 153(C), pages 284-305.

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