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Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer

Author

Listed:
  • Shingo Kaneta-Takada

    (The University of Tokyo)

  • Miho Kitamura

    (High Energy Accelerator Research Organization (KEK))

  • Shoma Arai

    (The University of Tokyo)

  • Takuma Arai

    (The University of Tokyo)

  • Ryo Okano

    (The University of Tokyo)

  • Le Duc Anh

    (The University of Tokyo
    Japan Science and Technology Agency)

  • Tatsuro Endo

    (The University of Tokyo)

  • Koji Horiba

    (High Energy Accelerator Research Organization (KEK))

  • Hiroshi Kumigashira

    (High Energy Accelerator Research Organization (KEK)
    Tohoku University)

  • Masaki Kobayashi

    (The University of Tokyo
    The University of Tokyo)

  • Munetoshi Seki

    (The University of Tokyo
    The University of Tokyo)

  • Hitoshi Tabata

    (The University of Tokyo
    The University of Tokyo)

  • Masaaki Tanaka

    (The University of Tokyo
    The University of Tokyo)

  • Shinobu Ohya

    (The University of Tokyo
    The University of Tokyo)

Abstract

The two-dimensional electron gas (2DEG) formed at interfaces between SrTiO3 (STO) and other oxide insulating layers is promising for use in efficient spin-charge conversion due to the large Rashba spin-orbit interaction (RSOI). However, these insulating layers on STO prevent the propagation of a spin current injected from an adjacent ferromagnetic layer. Moreover, the mechanism of the spin-current flow in these insulating layers is still unexplored. Here, using a strongly correlated polar-metal LaTiO3+δ (LTO) interlayer and the 2DEG formed at the LTO/STO interface in an all-epitaxial heterostructure, we demonstrate giant spin-to-charge current conversion efficiencies, up to ~190 nm, using spin-pumping ferromagnetic-resonance voltage measurements. This value is the highest among those reported for all materials, including spin Hall systems. Our results suggest that the strong on-site Coulomb repulsion in LTO and the giant RSOI of LTO/STO may be the key to efficient spin-charge conversion with suppressed spin-flip scattering. Our findings highlight the hidden inherent possibilities of oxide interfaces for spin-orbitronics applications.

Suggested Citation

  • Shingo Kaneta-Takada & Miho Kitamura & Shoma Arai & Takuma Arai & Ryo Okano & Le Duc Anh & Tatsuro Endo & Koji Horiba & Hiroshi Kumigashira & Masaki Kobayashi & Munetoshi Seki & Hitoshi Tabata & Masaa, 2022. "Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33350-5
    DOI: 10.1038/s41467-022-33350-5
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    References listed on IDEAS

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