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Ferroelectric freestanding hafnia membranes with metastable rhombohedral structure down to 1-nm-thick

Author

Listed:
  • Yufan Shen

    (Kyoto University)

  • Kousuke Ooe

    (Japan Fine Ceramics Center)

  • Xueyou Yuan

    (Nagoya University)

  • Tomoaki Yamada

    (Nagoya University
    Tokyo Institute of Technology)

  • Shunsuke Kobayashi

    (Japan Fine Ceramics Center)

  • Mitsutaka Haruta

    (Kyoto University)

  • Daisuke Kan

    (Kyoto University)

  • Yuichi Shimakawa

    (Kyoto University)

Abstract

Two-dimensional freestanding membranes of materials, which can be transferred onto and make interfaces with any material, have attracted attention in the search for functional properties that can be utilized for next-generation nanoscale devices. We fabricated stable 1-nm-thick hafnia membranes exhibiting the metastable rhombohedral structure and out-of-plane ferroelectric polarizations as large as 13 μC/cm2. We also found that the rhombohedral phase transforms into another metastable orthorhombic phase without the ferroelectricity deteriorating as the thickness increases. Our results reveal the key role of the rhombohedral phase in the scale-free ferroelectricity in hafnia and also provide critical insights into the formation mechanism and phase stability of the metastable hafnia. Moreover, ultrathin hafnia membranes enable heterointerfaces and devices to be fabricated from structurally dissimilar materials beyond structural constrictions in conventional film-growth techniques.

Suggested Citation

  • Yufan Shen & Kousuke Ooe & Xueyou Yuan & Tomoaki Yamada & Shunsuke Kobayashi & Mitsutaka Haruta & Daisuke Kan & Yuichi Shimakawa, 2024. "Ferroelectric freestanding hafnia membranes with metastable rhombohedral structure down to 1-nm-thick," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49055-w
    DOI: 10.1038/s41467-024-49055-w
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