Domain switching mechanism in binary ferroelectric

• Project/Area Number: 20H00314
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Itoh Mitsuru 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 招聘研究員 (30151541)
• Co-Investigator(Kenkyū-buntansha): 高島 浩 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 上級主任研究員 (10357353) ; 森分 博紀 一般財団法人ファインセラミックスセンター, その他部局等, 主席研究員 (40450853) ; 佐藤 幸生 九州大学, 工学研究院, 准教授 (80581991)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥45,500,000 (Direct Cost: ¥35,000,000、Indirect Cost: ¥10,500,000); Fiscal Year 2022: ¥14,040,000 (Direct Cost: ¥10,800,000、Indirect Cost: ¥3,240,000); Fiscal Year 2021: ¥14,040,000 (Direct Cost: ¥10,800,000、Indirect Cost: ¥3,240,000); Fiscal Year 2020: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
• Keywords: 強誘電性 / ウルツァイト型 / 分極反転 / ２元化合物強誘電体 / 2次元化合物強誘電体 / 分極反転機構 / 単結晶薄膜 / 2元化合物強誘電体

Outline of Research at the Start

本研究は、申請者のグループが率先して過去６年に亘って精力的に研究を進めてきた陽性、陰性の２元素からなる化合物強誘電体（ウルツァイト型、κアルミナ型）の分極反転メカニズムについて、実験と計算を通して普遍的な物質体系を構築し、２元化合物強誘電体の潜在能力を定量的に詳らかにする。その結果をもとに他の構造を持つ強誘電体の分極反転メカニズムと比較検討し、本研究で得られる新規強誘電体の設計指針を学界・産業界に提案し学問的・応用的見地から展開することを最終目的とする。

Outline of Final Research Achievements

In this study, we have attempted to synthesize nitride thin films by material synthesis based on our previous experience in ferroelectric design. The ferroelectricity of single-crystal thin films of wurtzite-type and κ-alumina-type compounds, which have been developed so far, was clarified experimentally and computationally, and the mechanism of polarization inversion in two uniaxial ferroelectric groups, which enables polarization inversion under an external electric field, was discussed in detail in connection with the effect of elemental substitution, and the optimum material selection and Experiments were conducted. We have explored the details of crystallinity, surface flatness, and cross-sectional structure of AlN and GaN matrices and Sc-doped materials by vapor-phase growth to realize high-quality thin films with excellent atomic flatness.

Academic Significance and Societal Importance of the Research Achievements

陽性、陰性の２元素からなる化合物強誘電体（ウルツァイト型）の分極反転メカニズムについて、実験と計算を通して普遍的な物質体系を構築し、２元化合物強誘電体の潜在能力を詳らかにすることにより、新規強誘電体の設計指針を世界に提案し展開する。得られた結果と既知の強誘電体の分極反転メカニズムを比較し、3元以上の強誘電体で第3の元素が化学結合で果たす役割を明確することで未知の強誘電体構造を設計・探索する際の戦略を得る。

Research Products

• [Journal Article] Low-Temperature Direct Synthesis of Multilayered h-BN without Catalysts by Inductively Coupled Plasma-Enhanced Chemical Vapor Deposition (2023)
  • Author(s): Yamamoto Masaya、Murata Hiromasa、Miyata Noriyuki、Takashima Hiroshi、Nagao Masayoshi、Mimura Hidenori、Neo Yoichiro、Murakami Katsuhisa
  • Journal Title: ACS Omega Volume: 8 Issue: 6 Pages: 5497-5505
  • DOI: 10.1021/acsomega.2c06757
  • Peer Reviewed / Open Access
• [Journal Article] Chemical design of a new displacive-type ferroelectric (2022)
  • Author(s): Itoh Mitsuru、Hamasaki Yosuke、Takashima Hiroshi、Yokoi Rie、Taguchi Ayako、Moriwake Hiroki
  • Journal Title: Dalton Transactions Volume: 51 Issue: 7 Pages: 2610-2630
  • DOI: 10.1039/d1dt03693a
  • Peer Reviewed
• [Journal Article] Optical selection rules of the magnetic excitation in the S=1/2 one-dimensional Ising-like antiferromagnet BaCo2V2O8 (2022)
  • Author(s): S. Kimura, H. Onishi, A. Okutani, M. Akaki, Y. Narumi, M. Hagiwara, K. Okunishi, K. Kindo, Z. He, T. Taniyama, M. Itoh
  • Journal Title: Phys. Rev. B Volume: 105 Issue: 1 Pages: 014417-014417
  • DOI: 10.1103/physrevb.105.014417
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Host Lattice-Excitation-Enhanced Photoluminescence in Eu3+-Doped LaInO3 Epitaxial Films (2021)
  • Author(s): Oshime Norihiro、Ueda Kazushige、Takashima Hiroshi
  • Journal Title: Crystal Growth & Design Volume: 21 Issue: 5 Pages: 2663-2667
  • DOI: 10.1021/acs.cgd.0c01531
  • Peer Reviewed
• [Journal Article] Ferroelectric and magnetic properties in ε-Fe2O3 epitaxial film (2021)
  • Author(s): Hamasaki Yosuke、Yasui Shintaro、Katayama Tsukasa、Kiguchi Takanori、Sawai Shinya、Itoh Mitsuru
  • Journal Title: Applied Physics Letters Volume: 119 Issue: 18 Pages: 182904-182904
  • DOI: 10.1063/5.0063021
  • Peer Reviewed
• [Journal Article] Epitaxial pillar matrix nanocomposite thin films of Bi-Ti-Fe-O and CoFe2O4 grown on SrTiO3 (110) (2021)
  • Author(s): Kawahira Y.、Harada R.、Maruyama S.、Koganezawa T.、Yasui S.、Itoh M.、Matsumoto Y.
  • Journal Title: Journal of Applied Physics Volume: 130 Issue: 8 Pages: 084101-084101
  • DOI: 10.1063/5.0060610
  • Peer Reviewed
• [Journal Article] Single-Crystal Synthesis of ε-Fe2O3-Type Oxides Exhibiting Room-Temperature Ferrimagnetism and Ferroelectric Polarization (2021)
  • Author(s): Zhang Yang、Wang Hui、Tachiyama Koki、Katayama Tsukasa、Zhu Yinghao、Wu Si、Li Hai-Feng、Fang Jinghong、Li Qin、Shi Yun、Wang Ling、Fu Zhengqian、Xu Fangfang、Yu Jianding、Yasui Shintaro、Itoh Mitsuru
  • Journal Title: Crystal Growth & Design Volume: 21 Issue: 9 Pages: 4904-4908
  • DOI: 10.1021/acs.cgd.1c00310
  • Peer Reviewed
• [Journal Article] A computational search for wurtzite-structured ferroelectrics with low coercive voltages (2020)
  • Author(s): Moriwake Hiroki、Yokoi Rie、Taguchi Ayako、Ogawa Takafumi、Fisher Craig A. J.、Kuwabara Akihide、Sato Yukio、Shimizu Takao、Hamasaki Yosuke、Takashima Hiroshi、Itoh Mitsuru
  • Journal Title: APL Materials Volume: 8 Issue: 12 Pages: 121102-121102
  • DOI: 10.1063/5.0023626
  • Peer Reviewed
• [Journal Article] Role of Pr3+ ions as hole-trapping centers for the electroluminescence of (Ca0.6Sr0.4)0.998Pr0.002Ti0.9Al0.1O3?δ thin films (2020)
  • Author(s): Kyomen Toru, Takashima Hiroshi
  • Journal Title: Japanese Journal of Applied Physics Volume: 59 Issue: 9 Pages: 092005-092005
  • DOI: 10.35848/1347-4065/abb033
  • Peer Reviewed
• [Journal Article] Electroluminescence in perovskite oxide nanocrystals (2020)
  • Author(s): Oshime Norihiro、Hakuta Yukiya、Takashima Hiroshi
  • Journal Title: AIP Advances Volume: 10 Issue: 6 Pages: 065131-065131
  • DOI: 10.1063/5.0009539
  • Peer Reviewed