Fabrication of completely feffomagnetic pn junction diode based on iron oxide thin films

• Project/Area Number: 26600092
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: The University of Tokyo
• Principal Investigator: Seki Munetoshi 東京大学, 工学(系)研究科(研究院), 助教 (40432439)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 酸化鉄 / パルスレーザー堆積法 / 強磁性半導体 / 酸化物スピントロニクス / フェリ磁性酸化物 / 酸化鉄半導体

Outline of Final Research Achievements

Epitaxial thin films of iron oxides with high spin polarization were fabricated using pulsed laser deposition toward the spin rectifying devices. Single crystalline-Si-substituted Fe2O3 thin films were formed using two-step laser ablation technique. They exhibited ferromagnetic behavior and spin polarization of 31% at room temperature. We also succeeded in fabricating the epitaxial thin films of p-type transparent Si:FeO using pulsed laser deposition. In the double layer structure of Fe3O4/Si:FeO, spin-polarized carriers were injected into the Si:FeO layer from the Fe3O4 ferromagnetic layer at room temperature.

Research Products

• [Journal Article] Evaluation of hydration in a water-soluble polymer by terahertz spectroscopy (2016)
  • Author(s): Shunsuke Kawabe, Munetoshi Seki, and Hitoshi Tabata
  • Journal Title: Applied Physics Letters Volume: 108 Issue: 8 Pages: 81103-81103
  • DOI: 10.1063/1.4942411
  • Peer Reviewed
• [Journal Article] Spin-glass behaviors in carrier polarity controlled Fe3-xTixO4 semiconductor thin film (2015)
  • Author(s): H. Yamahara, M. Seki, M. Adachi, M. Takahashi, H. Nasu, K. Horiba, H. Kumigashira and H. Tabata
  • Journal Title: J.Appl.Phys. Volume: 118 Issue: 6 Pages: 0639051-0639057
  • DOI: 10.1063/1.4928408
  • Peer Reviewed
• [Journal Article] Long-term potentiation of magnonic synapses by photocontrolled spin current mimicked in reentrant spin-glass garnet ferrite Lu3Fe5-2xCoxSixO12 thin films (2015)
  • Author(s): Masaki Adachi, Munetoshi Seki, Hiroyasu Yamahara, Hidekazu Nasu, and Hitoshi Tabata
  • Journal Title: Applied Physics Express Volume: 8 Issue: 4 Pages: 0430021-4
  • DOI: 10.7567/apex.8.043002
  • NAID: 210000137466
  • Peer Reviewed
• [Journal Article] High-Temperature Terahertz Absorption Band in Rare-Earth Gallium (2014)
  • Author(s): M. Adachi, H. Matsui, M. Seki, H. Yamahara and Hitoshi Tabata
  • Journal Title: PHYSICAL REVIEW B Volume: 91 Issue: 8 Pages: 0851181-7
  • DOI: 10.1103/physrevb.91.085118
  • Peer Reviewed
• [Journal Article] Fabrication and characterization of wustite-based epitaxial thin films: p-type wide-gap oxide semiconductors composed of abundant elements (2014)
  • Author(s): M. Seki, M. Takahashi, M. Adachi, H. Yamahara and H. Tabata
  • Journal Title: Appl. Phys. Lett. Volume: 105 Issue: 11 Pages: 112105-112105
  • DOI: 10.1063/1.4896316
  • Peer Reviewed
• [Journal Article] Highly spin-polarized current in Co-substituted Fe3O4 epitaxial thin films at room temperature (2014)
  • Author(s): M. Takahashi, T. Oshima, H. Yamahara, M. Seki and H. Tabata,
  • Journal Title: Journal of Appl. Phys. Volume: 116 Issue: 21 Pages: 2139071-4
  • DOI: 10.1063/1.4903215
  • Peer Reviewed
• [Presentation] Fe2O3-based tunable ferromagnetic semiconductors with high spin polarization at room temperature (2016)
  • Author(s): Munetoshi Seki
  • Organizer: Annual World Congress of Smart Materials-2016
  • Place of Presentation: Singapore, Singapore
  • Year and Date: 2016-03-06
  • Int'l Joint Research / Invited
• [Presentation] Functional devices based on iron oxide heterostructure (2015)
  • Author(s): Munetoshi Seki
  • Organizer: CEMS Topical Meeting on Oxide Interfaces
  • Place of Presentation: 理化学研究所大河内記念ホール、埼玉県和光市
  • Year and Date: 2015-11-06
  • Invited
• [Presentation] Photoelectrochemical Water Splitting without External Applied Voltage Using Iron Oxide Electrodes (2015)
  • Author(s): Munetoshi Seki
  • Organizer: The 5th Annual World Congress of Nano Science and Technology-2015
  • Place of Presentation: Xian, China
  • Year and Date: 2015-09-25
  • Int'l Joint Research / Invited
• [Presentation] Photoelectrochemical Water Splitting without External Appied Voltage Using Iron Oxide Electrodes (2015)
  • Author(s): Munetoshi Seki, Masaki Adachi, Masanao Takahashi, Hiroyasu Yamahara, and Hitoshi Tabata
  • Organizer: Nano Science and Technology-2015
  • Place of Presentation: Xi'an, China
  • Year and Date: 2015-09-24 – 2015-09-26
  • Invited
• [Presentation] Highly spin polarization at room temperature in iron oxide-based ferromagnetic semiconductors (2015)
  • Author(s): Munetoshi and Hitoshi Tabata
  • Organizer: Energy Materials Nanotechnology 2015
  • Place of Presentation: Phuket, Thailand
  • Year and Date: 2015-05-06
  • Invited
• [Presentation] High spin polarization at room temperature in iron oxide-based ferromagnetic semiconductors (2015)
  • Author(s): Munetoshi Seki
  • Organizer: Energy Materials Nanotechnology 2015
  • Place of Presentation: Phuket, Thailand
  • Year and Date: 2015-05-05
  • Int'l Joint Research / Invited
• [Presentation] P型透明酸化物半導体Si:FeOのエピタキシャル薄膜の形成 (2015)
  • Author(s): 関 宗俊、シャモハディ アミン、高橋 雅尚、足立 真輝、那須 英和、山原 弘靖、田畑 仁
  • Organizer: 第62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学、神奈川県
  • Year and Date: 2015-03-11
• [Presentation] スピネル型フェライト(Fe,Ti)3O4薄膜のキャリア極性制御 (2015)
  • Author(s): 山原 弘靖、足立 真輝、高橋 雅尚、関 宗俊、堀場 弘司、組頭 広志、田畑 仁
  • Organizer: 第62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学、神奈川県
  • Year and Date: 2015-03-11
• [Presentation] パルスレーザー蒸着法を用いたNd3Fe5O12薄膜作製とその磁気特性 (2015)
  • Author(s): 那須 英和、足立 真輝、山原 弘靖、関 宗俊、 田畑 仁
  • Organizer: 第62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学、神奈川県
  • Year and Date: 2015-03-11
• [Presentation] Lu3Fe5-2xCoxSixO12薄膜におけるリエントラントクラスターグラス特性 (2015)
  • Author(s): 足立 真輝、那須 英和、山原 弘靖、関 宗俊、松井 裕章、田畑 仁
  • Organizer: 第62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学、神奈川県
  • Year and Date: 2015-03-11
• [Presentation] High-frequency magnetic resonance in strained rare-earth iron garnet thin films (2015)
  • Author(s): Masaki Adachi, Hidekazu Nasu, HIroyasu Yamahara, Munetoshi Seki, Hiroaki Matsui, Hitoshi Tabata
  • Organizer: 第62回応用物理学会春季学術講演会
  • Place of Presentation: 東海大学、神奈川県
  • Year and Date: 2015-03-11
• [Presentation] 希土類ガーネット薄膜における電界誘起スピン波とエピタキシャル歪相関 (2014)
  • Author(s): 足立 真輝、那須 英和、山原 弘靖、関 宗俊、松井 裕章、田畑 仁
  • Organizer: 第19回半導体スピン工学の基礎と応用
  • Place of Presentation: 東京大学、東京都
  • Year and Date: 2014-12-16
• [Presentation] Highly spin-polarized current in Co-substituted Fe3O4 epitaxial thin films at room temperature and construction of magnetic tunnel junction device (2014)
  • Author(s): Masanao Takahashi, Hiroyasu Yamahara, Munetoshi Seki, and Hitoshi Tabata
  • Organizer: The 3rd International Workshop on Nanoscale Electron-Photon Interactions via Energy Dissipation and Fluctuation
  • Place of Presentation: 東京大学、東京都
  • Year and Date: 2014-11-17
• [Presentation] Electrically-induced ultrafast spin wave in rare-earth garnet ferrite with an asymmetric epitaxial stress (2014)
  • Author(s): Masaki Adachi, Hidekazu Nasu, Hiroyasu Yamahara, Munetoshi Seki, Hiroaki Matsui, and Hitoshi Tabata
  • Organizer: The 3rd International Workshop on Nanoscale Electron-Photon Interactions via Energy Dissipation and Fluctuation
  • Place of Presentation: 東京大学、東京都
  • Year and Date: 2014-11-17
• [Presentation] Enhanced photoactivity of α-Fe2O3 electrode by bandgap engineering and surface plasmon technique for high-efficiency water splitting (2014)
  • Author(s): Munetoshi Seki and Hitoshi Tabata
  • Organizer: Nano Science and Technology-2014
  • Place of Presentation: Qingdao, China
  • Year and Date: 2014-10-30
  • Invited
• [Presentation] Electromagnon States of Dipole-Spin Ordered Garnet Ferrite Films Measured by Terahertz-Time Domain Spectroscopy (2014)
  • Author(s): Masaki Adachi, Hiroyasu Yamahara, Munetoshi Seki, and Hitoshi Tabata
  • Organizer: The 21th International Workshop on Oxide Electronics
  • Place of Presentation: New York, United States
  • Year and Date: 2014-09-30
• [Presentation] 鉄さび（酸化鉄）半導体の光・電子機能制御 (2014)
  • Author(s): 関 宗俊、田畑 仁
  • Organizer: 日本学術振興会 ワイドギャップ半導体光・電子デバイス第162委員会 第92回研究会
  • Place of Presentation: 京都大学東京オフィス、東京都
  • Year and Date: 2014-09-26
  • Invited
• [Presentation] Terahertz Magnonics Using Ultrathin Films of Samarium Ferrite Garnet (2014)
  • Author(s): Masaki Adachi, Hiroyasu Yamahara, Munetoshi Seki, Hiroaki Matsui, and Hitoshi Tabata
  • Organizer: The 39th International Conference on Infrared, Millimeter, and THz Waves
  • Place of Presentation: Arizona, United States
  • Year and Date: 2014-09-18
• [Presentation] スピネル型フェライト(Fe,Ti)3O4薄膜の電気伝導性制御 (2014)
  • Author(s): 山原 弘靖、高橋 雅尚、関 宗俊、田畑 仁
  • Organizer: 第75回応用物理学会秋季学術講演会
  • Place of Presentation: 北海道大学、北海道
  • Year and Date: 2014-09-17
• [Presentation] Excitation of Electric-Field-induced Spin Wave in the Strained Garnet Ferrite Thin Films Using Sub- Picosecond Pulsed Wave (2014)
  • Author(s): Masaki Adachi, Hiroyasu, Yamahara, Munetoshi Seki, Hiroaki Matsui, and Hitoshi Tabata
  • Organizer: The 46th International Conference on Solid State Devices and Materials
  • Place of Presentation: 筑波国際会議場、茨城県
  • Year and Date: 2014-09-09
• [Presentation] フェライトエンジニアリング： ありふれた元素でつくる室温スピン・光・電子機能材料 (2014)
  • Author(s): 関 宗俊
  • Organizer: Core-to-Core若手研究者育成プログラムセミナー
  • Place of Presentation: 東京大学、東京都
  • Year and Date: 2014-07-17
  • Invited
• [Presentation] 磁性絶縁体希土類フェライトガーネット薄膜におけるエピタキシャル歪-磁気特性相関 (2014)
  • Author(s): 足立 真輝、山原 弘靖、関 宗俊、松井 裕章、田畑 仁
  • Organizer: 基盤S研究会「多自由度放射光X線二色性分光による強相関系界面新規電子相の研究」
  • Place of Presentation: 熱海KKRホテル、神奈川県
  • Year and Date: 2014-07-14
• [Presentation] ron oxide engineering for solar energy harvesting and room temperature spintronics (2014)
  • Author(s): Munetoshi Seki
  • Organizer: Netherlands-Japan Workshop on Oxide Electronics and Related Sciences
  • Place of Presentation: Twente, Netherlands
  • Year and Date: 2014-06-04
  • Invited