Polarization Rotation: Designing and Realizing Large Piezoelectric Responses

• Project/Area Number: 17H04952
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Inorganic materials/Physical properties
• Research Institution: Kyushu University
• Principal Investigator: Hojo Hajime 九州大学, 総合理工学研究院, 准教授 (90611369)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000); Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2017: ¥13,780,000 (Direct Cost: ¥10,600,000、Indirect Cost: ¥3,180,000)
• Keywords: 非鉛圧電体 / 分極回転 / マルチフェロイック / 圧電体 / 透過型電子顕微鏡 / ドメイン壁 / 強誘電体 / 薄膜

Outline of Final Research Achievements

The aim of this project is to develop lead-free piezoelectric materials based on the "polarization rotation" mechanism. Enhanced piezoelectric responses were realized in BiFe1-xGaxO3 thin films by optimizing the orientation of the thin films so that the effect of "polarization rotation" can be effectively utilized. On the other hand, the coexistence of ferroelectric and weakly ferromagnetic orders was confirmed at room temperature in BiFe0.9Co0.1O3 thin film. Moreover, an out-of-plane magnetization reversal by polarization switching was demonstrated, which paves the way to low-power-consumption magnetic memories.

Academic Significance and Societal Importance of the Research Achievements

非鉛圧電体であるBiFe1-xGaxO3薄膜について「分極回転」の効果を効果的に利用できるような配向制御をすることで、圧電特性を向上させることに成功した。分極回転という圧電体の材料設計指針を実証できた点で非常に重要な成果である。また、マルチフェロイック特性を有したBiFe0.9Co0.1O3薄膜については、室温での電場による磁化反転を実証できた。この成果により、電場により制御可能な省電力の磁気メモリ実現の路が拓かれたと考えている。

Research Products

• [Journal Article] Modulating the Structure and Magnetic Properties of ε-Fe2O3Nanoparticles via Electrochemical Li+ Insertion (2020)
  • Author(s): Sou Yasuhra, Yosuke Hamasaki, Tsukasa Katayama, Takahiro Ao, Yoshiyuki Inaguma, Hajime Hojo, Maarit Karppinen, Anish Philip, Shintaro Yasui, and Mitsuru Itoh
  • Journal Title: Inorganic Chemistry Volume: 59 Issue: 7 Pages: 4357-4365
  • DOI: 10.1021/acs.inorgchem.9b03302
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sodium titanium oxide bronze nanoparticles synthesized via concurrent reduction and Na+-doping into TiO2(B) (2019)
  • Author(s): George Hasegawa,* Moeko Tanaka, Junie Jhon M. Vequizo, Akira Yamakata, Hajime Hojo, Makoto Kobayashi, Masato Kakihana, Miki Inada, Hirofumi Akamatsu, Katsuro Hayashi*
  • Journal Title: Nanoscale Volume: in press Issue: 3 Pages: 1442-1450
  • DOI: 10.1039/c8nr08372j
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Large Negative Thermal Expansion Induced by Synergistic Effects of Ferroelectrostriction and Spin Crossover in PbTiO3-Based Perovskites (2019)
  • Author(s): Z. Pan, J. Chen, R. Yu, L. Patra, P. Ravindran, A. Sanson, R. Milazzo, A. Carnera, L. Hu, L. Wang, H. Yamamoto, Y. Ren, Q. Huang, Y. Sakai, T. Nishikubo, T. Ogata, X. Fan, Y. Li, G. Li, H. Hojo, M. Azuma, X. Xing
  • Journal Title: Chem. Mater. Volume: 31 Issue: 4 Pages: 1296-1303
  • DOI: 10.1021/acs.chemmater.8b04266
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Enhanced Negative Thermal Expansion Induced by Simultaneous Charge Transfer and Polar-Nonpolar Transitions (2019)
  • Author(s): Takumi Nishikubo, Yuki Sakai, Kengo Oka, Tetsu Watanuki, Akihiko Machida, Masaichiro Mizumaki, Koki Maebayashi, Takashi Imai, Takahiro Ogata, Keisuke Yokoyama, Yoichi Okimoto, Shin-ya Koshihara, Hajime Hojo, Takashi Mizokawa and Masaki Azuma
  • Journal Title: J. Am. Chem. Soc. Volume: 141 Issue: 49 Pages: 19397-19403
  • DOI: 10.1021/jacs.9b10336
  • Peer Reviewed
• [Journal Article] Direct Observation of Magnetization Reversal by Electric Field at Room Temperature in Co-Substituted Bismuth Ferrite Thin Film (2019)
  • Author(s): Shimizu Keisuke、Kawabe Ryo、Hojo Hajime、Shimizu Haruki、Yamamoto Hajime、Katsumata Marin、Shigematsu Kei、Mibu Ko、Kumagai Yu、Oba Fumiyasu、Azuma Masaki
  • Journal Title: Nano Letters Volume: 19 Issue: 3 Pages: 1767-1773
  • DOI: 10.1021/acs.nanolett.8b04765
  • Peer Reviewed
• [Journal Article] Room temperature ferromagnetism in BiFe1－xMnxO3 thin film induced by spin-structure manipulation (2018)
  • Author(s): Kei Shigematsu, Takeshi Asakura, Hajime Yamamoto, Keisuke Shimizu, Marin Katsumata, Haruki Shimizu, Yuki Sakai, Hajime Hojo, Ko Mibu, and Masaki Azuma
  • Journal Title: Appl. Phys. Lett. Volume: 109 Issue: 19 Pages: 192905-192905
  • DOI: 10.1063/1.5024710
  • Peer Reviewed
• [Journal Article] Development of Bismuth Ferrite as a Piezoelectric and Multiferroic material (2018)
  • Author(s): H. Hojo, K. Oka, K. Shimizu, H. Yamamoto, R. Kawabe, and M. Azuma
  • Journal Title: Adv. Mater. Volume: 印刷中
  • Peer Reviewed
• [Presentation] ε-Fe2O3ナノ粒子へのLi+挿入とその挿入課程の調査 (2020)
  • Author(s): 安原颯、濵嵜容丞、阿尾貴博、稲熊宜之、北條元、安井伸太郎、伊藤満
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] Reversible phase transition and irreversible topochemical reaction in a perovskite-type CuNbO3 (2019)
  • Author(s): M. Fukuda, I. Yamada, H. Murata, H. Hojo, K. Tanaka, and K. Fujita
  • Organizer: The 11th International Conference on the Science and Technology for Advanced Ceramics（STAC-11）
  • Int'l Joint Research
• [Presentation] Polarization rotation as the origin of enhanced piezoelectric response in BiFe1-xCoxO3 and BiFe1-xGaxO3 thin films (2019)
  • Author(s): H. Hojo, K. Shimizu, M. Azuma
  • Organizer: Asia-Pacific PFM 2019
  • Int'l Joint Research / Invited
• [Presentation] Magnetization Reversal by Electric Field at Room Temperature in BiFe0.9Co0.1O3 Epitaxial Thin Film (2019)
  • Author(s): H. Hojo, K. Shimizu, R. Kawabe, H. Yamamoto, H. Shimizu, M. Katsumata, K. Mibu, M. Azuma
  • Organizer: 26TH INTERNATIONAL WORKSHOP ON OXIDE ELECTRONIcs (iWOE 26)
  • Int'l Joint Research
• [Presentation] ε-Fe2O3ナノ粒子へのLi+挿入とその磁気物性 (2019)
  • Author(s): 安原颯、濵嵜容丞、阿尾貴博、北條元、安井伸太郎、伊藤満
  • Organizer: 強的秩序とその操作に関する研究グループ第9回研究会 （若手夏の学校）
• [Presentation] BiFe1-xCoxO3エピタキシャル薄膜における室温での電場印加磁化反転 (2019)
  • Author(s): 北條元、清水啓佑、川邉諒、壬生攻、東正樹
  • Organizer: 強的秩序とその操作に関する研究グループ第9回研究会 （若手夏の学校）
• [Presentation] 電気化学的手法によりLi挿入したε-Fe2O3ナノ粒子の磁性 (2019)
  • Author(s): 安原颯、濵嵜容丞、阿尾貴博、稲熊宜之、北條元、安井伸太郎、伊藤満
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] Co置換によるBiFeO3の圧電・マルチフェロイック特性制御 (2019)
  • Author(s): 北條元、清水啓佑、川邉諒、山本孟、壬生攻、東正樹
  • Organizer: 強誘電体関連物質の機能発現に関する構造科学の新展開
  • Invited
• [Presentation] Co置換BiFeO3薄膜における電場による面外磁化の反転 (2018)
  • Author(s): 清水 啓佑、川邊 諒、北條 元、山本 孟、壬生 攻、東 正樹
  • Organizer: 第65回応用物理学会春期学術講演会
• [Presentation] Co置換によるBiFeO3の圧電特性・マルチフェロイック特性制御 (2018)
  • Author(s): 北條 元
  • Organizer: 東京工業大学、第70回フロンティア材料研究所講演会
  • Invited
• [Presentation] Co置換BiFeO3薄膜における電場印加による磁化反転 (2018)
  • Author(s): 北條 元
  • Organizer: 第28回日本MRS年次大会
  • Invited
• [Presentation] Structural and Magnetic Evolution of Co Substituted BiFeO3 (2018)
  • Author(s): Hajime Hojo
  • Organizer: Key Laboratory of Extreme Conditions Physics, CAS, Young Academic Forum(36)
  • Invited
• [Presentation] Enhanced Piezoelectric Response Due to Polarization Rotation in Co-substituted BiFeO3 Epitaxial Thin Films (2017)
  • Author(s): K. Shimizu, H. Hojo, Y. Ikuhara, M. Azuma
  • Organizer: IEEE ISAF-IWATMD-PFM
  • Int'l Joint Research
• [Presentation] Enhanced piezoelectric response due to polarization rotation in cobalt-substituted BiFeO3 epitaxial thin films (2017)
  • Author(s): K. Shimizu, H. Hojo, Y. Ikuhara, M. Azuma
  • Organizer: JSPM international Conference on Powder and Powder Metallurgy 60th Anniversary
  • Int'l Joint Research
• [Presentation] Polarization rotation in BiFe1-xCoxO3 and BiFe1-xGaxO3 epitaxial thin films (2017)
  • Author(s): K. Shimizu, H. Hojo, M. Azuma
  • Organizer: The 2nd International Symposium on Negative Thermal Expansion and Related Materials
  • Int'l Joint Research