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

Yufan Shen, Kousuke Ooe, Xueyou Yuan, Tomoaki Yamada, Shunsuke Kobayashi, Mitsutaka Haruta, Daisuke Kan () and Yuichi Shimakawa
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Yufan Shen: Kyoto University
Kousuke Ooe: Japan Fine Ceramics Center
Xueyou Yuan: Nagoya University
Tomoaki Yamada: Nagoya University
Shunsuke Kobayashi: Japan Fine Ceramics Center
Mitsutaka Haruta: Kyoto University
Daisuke Kan: Kyoto University
Yuichi Shimakawa: Kyoto University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-49055-w

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