Ferroelectricity in single crystal strontium titanate films induced by thermal stress and clarification of its mechanism

• Project/Area Number: 20860036
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: YAMADA Tomoaki Tokyo Institute of Technology, 大学院・総合理工学研究科, 特任助教 (80509349)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,289,000 (Direct Cost: ¥2,530,000、Indirect Cost: ¥759,000); Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2008: ¥1,729,000 (Direct Cost: ¥1,330,000、Indirect Cost: ¥399,000)
• Keywords: 強誘電体薄膜 / 誘電体物性 / エピタキシャル / 単結晶成長 / 歪み・応力 / エピタキシャル・単結晶成長

Research Abstract

歪みより強誘電性を示すチタン酸ストロンチウム(SrTiO_3)について、基板と薄膜の熱膨張係数のミスマッチ、すなわち熱応力を利用して、薄膜における強誘電性の発現とその機構解明を試みた。SrTiO_3の約2倍の熱膨張係数をもつフッ化カルシウムを基板として用いることで、約0.7%の面内圧縮歪みを有したSrTiO_3膜が成長した。面内圧縮歪みにより、強誘電相転移温度が上昇し、また、酸素8面体の微小回転を伴う構造相転移温度も上昇する事が明らかになった。

Research Products

• [Journal Article] Antiferrodistortive Structural Phase Transition in Compressively-strained Epitaxial SrTiO_3 Film Grown on (La, Sr) (Al, Ta) O_3 Subtrate (2010)
  • Author(s): T.Yamada, T.Kiguchi, A.K.Tagantsev, H.Morioka, T.Iijima, H.Ohsumi, S.Kimura, M.Osada, N.Setter, H.Funakubo
  • Journal Title: Integrated Ferroelectrics (In press)
  • Peer Reviewed
• [Journal Article] Influence of Epitaxial Growth Orientation on Residual Strain and Dielectric Properties of(Ba_(0.3)Sr_(0.7))TiO_3 Films Grown on In-plane Compressive Substrates (2010)
  • Author(s): T.Yamada, T.Kamo, D.Su, T.Iijima, H.Funakubo
  • Journal Title: Ferroelectrics (In press)
  • Peer Reviewed
• [Journal Article] Antiferrodistortive Structural Phase Transition in Compressively-strained Epitaxial SrTiO3 Film Grown on (La, Sr)(Al, Ta)O3 Substrate
  • Author(s): T. Yamada, T. Kiguchi, A.K. Tagantsev, H. Morioka, T. Iijima, H. Ohsumi, S. Kimura, M. Osada, N. Setter, H. Funakubo
  • Journal Title: Integrated Ferroelectrics (印刷中)
  • Peer Reviewed
• [Journal Article] Influence of Epitaxial Growth Orientation on Residual Strain and Dielectric Properties of (Ba0. 3Sr0. 7)TiO3 Films Grown on In-plane Compressive Substrates
  • Author(s): T. Yamada, T. Kamo, D. Su, T. Iijima, H. Funakubo
  • Journal Title: Ferroelectrics (印刷中)
  • Peer Reviewed
• [Presentation] 歪みエピタキシャル(Ba, Sr)TiO3薄膜の強誘電相転移温度の配向依存性 (2010)
  • Author(s): 山田智明, 多久和至, 加茂嵩史, 飯島高志, 舟窪浩
  • Organizer: 日本セラミックス協会2010年年会
  • Place of Presentation: 小金井市東京農工大学
  • Year and Date: 2010-03-23
• [Presentation] 歪みエピタキシャル(Ba, Sr)TiO_3薄膜の強誘電相転移温度の配向依存性 (2010)
  • Author(s): 山田智明, 多久和至, 加茂嵩史, 飯島高志, 舟窪浩
  • Organizer: 日本セラミックス協会2010年年会
  • Place of Presentation: 小金井市東京農工大学
  • Year and Date: 2010-03-23
• [Presentation] 歪みエピタキシャル(Ba, Sr)TiO3薄膜における誘電特性の配向依存性 (2010)
  • Author(s): 山田智明, 多久和至, 加茂嵩史, 飯島高志, 舟窪浩
  • Organizer: 第57回応用物理学関連連合講演会
  • Place of Presentation: 平塚市東海大学
  • Year and Date: 2010-03-18
• [Presentation] 歪みエピタキシャル(Ba, Sr)TiO_3薄膜における誘電特性の配向依存性 (2010)
  • Author(s): 山田智明, 多久和至, 加茂嵩史, 飯島高志, 舟窪浩
  • Organizer: 第57回応用物理学関連連合講演会
  • Place of Presentation: 平塚市東海大学
  • Year and Date: 2010-03-18
• [Presentation] Strain-Controlled Epitaxial Perovskite Films For The Induced Ferroelectricity (2009)
  • Author(s): T. Yamada, T. Kamo, A.K. Tagantsev, I. Takuwa, T. Kiguchi, T. Iijima, M. Osada, O. Sakata, D. Su, N. Setter, H. Funakubo
  • Organizer: International Conference on Electroceramics 2009 (ICE2009)
  • Place of Presentation: New Delhi, India
  • Year and Date: 2009-12-17
• [Presentation] Strain-Controlled Epitaxial Perovskite Films For The Induced Ferroelectricity (2009)
  • Author(s): T.Yamada, T.Kamo, A.K.Tagantsev, I.Takuwa, T.Kiguchi, T.Iijima, M.Osada, O.Sakata, D.Su, N.Setter, H.Funakubo
  • Organizer: International Conference on Electroceramics 2009(ICE2009)
  • Place of Presentation: New Delhi, India
  • Year and Date: 2009-12-17
• [Presentation] 面内圧縮歪みチタン酸ストロンチウム薄膜におけるAntiferrodistortive相転移と強誘電相転移 (2009)
  • Author(s): 山田智明, A.K. Tagantsev, 木口賢紀, 飯島高志, 長田実, J. Trodahl, 森岡仁, N. Setter, 舟窪浩
  • Organizer: 日本物理学会領域10誘電体分科第1回誘電体若手秋の学校
  • Place of Presentation: 熱海市熱海研修センター
  • Year and Date: 2009-10-11
• [Presentation] Impact of Strain Modulation on Two Instabilities in (100)-Epitaxial SrTiO3 Thin Films (2009)
  • Author(s): T. Yamada, A.K. Tagantsev, T. Kiguchi, T. Iijima, M. Osada, J. Trodahl, H. Morioka, N. Setter, H. Funakubo
  • Organizer: Joint meeting of 12th International Meeting on Ferroelectricity and 18th IEEE International Symposium on Applications of Ferroelectrics (IMF-ISAF-2009)
  • Place of Presentation: Xian, China
  • Year and Date: 2009-08-26
• [Presentation] Impact of Strain Modulation on Two Instabilities in(100)-Epitaxial SrTiO_3 Thin Films (2009)
  • Author(s): T.Yamada, A.K.Tagantsev, T.Kiguchi, T.Iijima, M.Osada, J.Trodahl, H.Morioka, N.Setter, H.Funakubo
  • Organizer: Joint meeting of 12th International Meeting on Ferroelectricity and 18th IEEE International Symposium on Applications of Ferroelectrics(IMF-ISAF-2009)
  • Place of Presentation: Xian, China
  • Year and Date: 2009-08-26
• [Presentation] Strong Orientation Dependence of Strain Relaxation in Epitaxial(Ba, Sr)TiO_3 Films and the Resulting Dielectric Properties (2009)
  • Author(s): T.Yamada, T.Kamo, D.Su, T.Iijima, H.Funakubo
  • Organizer: Joint meeting of 12th International Meeting on Ferroelectricity and 18th IEEE International Symposium on Applications of Ferroelectrics(IMF-ISAF-2009)
  • Place of Presentation: Xian, China
  • Year and Date: 2009-08-24
• [Presentation] Strong Orientation Dependence of Strain Relaxation in Epitaxial (Ba, Sr)TiO3 Films and the Resulting Dielectric Properties (2009)
  • Author(s): T. Yamada, T. Kamo, D. Su, T. Iijima, H. Funakubo
  • Organizer: Joint meeting of 12th International Meeting on Ferroelectricity and 18th IEEE International Symposium on Applications of Ferroelectrics (IMF-ISAF-2009)
  • Place of Presentation: Xian, China
  • Year and Date: 2009-08-04
• [Presentation] 面内圧縮歪みチタン酸ストロンチウム薄膜におけるAFD相転移と強誘電相転移 (2009)
  • Author(s): 山田智明, A.K. Tagantsev, 木口賢紀, 大隅寛幸, 木村滋, 飯島高志, 森岡仁, 舟窪浩
  • Organizer: 第56回応用物理学関連連合講演会
  • Place of Presentation: つくば市筑波大学
  • Year and Date: 2009-03-30
• [Presentation] 面内圧縮歪みチタン酸ストロンチウム薄膜におけるAFD相転移と強誘電相転移 (2009)
  • Author(s): 山田智明
  • Organizer: 第56回応用物理学関連連合講演会
  • Place of Presentation: つくば市 筑波大学
  • Year and Date: 2009-03-30
• [Presentation] Antiferrodistortive/Ferroelectric Phase Transitions and Correlated Properties in Compressively-strained Epitaxial SrTiO3 Films (2008)
  • Author(s): T. Yamada, A.K. Tagantsev, H. Ohsumi, S. Kimura, T. Kamo, H. Morioka, K. Shinozaki, N. Setter, H. Funakubo
  • Place of Presentation: Boston MA, USA
  • Year and Date: 2008-12-03
• [Presentation] Antiferrodistortive/Ferroelectric Phase Transitions and Correlated Properties in Compressively-strained Epitaxial SrTiO_3 Films (2008)
  • Author(s): Tomoaki YAMADA
  • Organizer: 2008 MRS fall meeting
  • Place of Presentation: Boston MA, USA
  • Year and Date: 2008-12-03
• [Presentation] 歪みチタン酸ストロンチウム薄膜の強誘電相転移と誘電特性 (2008)
  • Author(s): 山田智明, 舟窪浩, 木村滋, 大隅寛幸
  • Organizer: 日本セラミックス協会第21回秋季シンポジウム
  • Place of Presentation: 北九州市北九州国際会議場
  • Year and Date: 2008-09-17
• [Presentation] 歪みチタン酸ストロンチウム薄膜の強誘電相転移と誘電特性 (2008)
  • Author(s): 山田智明
  • Organizer: 日本セラミックス協会第21回秋季シンポジウム
  • Place of Presentation: 北九州市 北九州国際会議場
  • Year and Date: 2008-09-17
• [Remarks]
  • URL: http://f-lab.iem.titech.ac.jp/f-lab.htm