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Title: Ferroelectric freestanding hafnia membranes with metastable rhombohedral structure down to 1-nm-thick
Authors: Shen, Yufan
Ooe, Kousuke
Yuan, Xueyou
Yamada, Tomoaki
Kobayashi, Shunsuke
Haruta, Mitsutaka  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-2237-7242 (unconfirmed)
Kan, Daisuke  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7505-0059 (unconfirmed)
Shimakawa, Yuichi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1019-2512 (unconfirmed)
Author's alias: 大江, 耕介
山田, 智明
小林, 俊介
治田, 充貴
菅, 大介
島川, 祐一
Keywords: Ferroelectrics and multiferroics
Solid-state chemistry
Two-dimensional materials
Issue Date: 25-Jun-2024
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 15
Thesis number: 4789
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/㎝². 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.
Description: 二次元強誘電体の作製に成功 --強誘電体デバイス開発の新しいルートを開拓--.京都大学プレスリリース. 2024-06-26.
Rights: © The Author(s) 2024
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
URI: http://hdl.handle.net/2433/289502
DOI(Published Version): 10.1038/s41467-024-49055-w
PubMed ID: 38918364
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2024-06-26-0
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