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Creation of highly-efficient spin injection source by interface modification in half-metallic oxides

Research Project

Project/Area Number 17H06482
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionHokkaido University

Principal Investigator

Hiura Satoshi  北海道大学, 情報科学研究科, 助教 (30799680)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords酸化鉄 / 走査型トンネル顕微鏡 / 表面修飾 / 局所仕事関数 / スピン輸送 / スピントロニクス / 半導体量子ドット / 結合量子ドット / マグネタイト / 水素吸着 / 炭素吸着 / 薄膜表面・界面物性 / 走査トンネル顕微鏡 / スピンエレクトロニクス / 光物性 / スピン注入 / 界面修飾 / スピンデバイス / 表面・界面物性 / 走査プローブ顕微鏡 / 電子・電気材料
Outline of Final Research Achievements

In this study, we aimed to realize an efficient electron spin injection into semiconductors by interface modification of Fe3O4/MgO toward the creation of spin-functional optical devices. We investigated the electronic properties of Fe3O4 surface modified with hydrogen or carbon atoms. The electron transfer from hydrogen atoms to surface and subsurface atoms was found to contribute to the improvement of the surface electron-spin polarization induced by hydrogen adsorption. In addition, we constructed a carbon deposition system and optimized growth conditions for sub-monolayer carbon films toward interface spin engineering. It was found that spin transport using quantum waves in the superlattice can suppress electron spin relaxation during transport. We also revealed that electronically coupled quantum dots are useful as a spin-polarized emitting material because of the electron-spin amplification at the excites states for them.

Academic Significance and Societal Importance of the Research Achievements

電子情報処理の省エネルギー化の切り札として実用化が期待される半導体スピントロニクスの展開において、電子スピンの生成源である強磁性電極材料、電子スピン状態を保持したまま長距離輸送できる半導体輸送材料、電子スピン状態を長時間保持できる高スピン偏極発光材料を創出することが重要である。本研究では、強磁性体の一つである酸化鉄に注目し、半導体への高効率な電子スピン注入を可能とする界面修飾に向けた実験的知見を得た。また、原理的に電子スピン緩和が生じない量子波による電子スピン輸送を提案し、実証した。さらに、量子ドット間で電子波動関数が結合した結合量子ドットが高スピン偏極発光材料として有用であることを見出した。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • Research Products

    (30 results)

All 2019 2018 2017 Other

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (22 results) (of which Int'l Joint Research: 14 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Electron-transfer-induced metallic electronic states in a H/Fe3O4(001) film subsurface2019

    • Author(s)
      Hiura Satoshi, Subagyo Agus, Murayama Akihiro, Sueoka Kazuhisa
    • Journal Title

      Applied Physics Express

      Volume: 12 Issue: 5 Pages: 055502-055502

    • DOI

      10.7567/1882-0786/ab10ce

    • NAID

      120006842189

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electric field control of spin polarity in spin injection into InGaAs quantum dots from a tunnel-coupled quantum well2019

    • Author(s)
      Chen Hang, Hiura Satoshi, Takayama Junichi, Park Soyoung, Sueoka Kazuhisa, Murayama Akihiro
    • Journal Title

      Applied Physics Letters

      Volume: 114 Issue: 13

    • DOI

      10.1063/1.5090419

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quantum spin transport to semiconductor quantum dots through superlattice2019

    • Author(s)
      Hiura Satoshi, Itabashi Kodai, Takeishi Kazuki, Takayama Junichi, Kiba Takayuki, Murayama Akihiro
    • Journal Title

      Applied Physics Letters

      Volume: 114 Issue: 7

    • DOI

      10.1063/1.5080999

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Interdot carrier and spin dynamics in a two-dimensional high-density quantum-dot array of InGaAs with quantum dots embedded as local potential minima2019

    • Author(s)
      Hiura Satoshi, Urabe Masayuki, Takeishi Kazuki, Itabashi Kodai, Takayama Junichi, Kiba Takayuki, Sueoka Kazuhisa, Murayama Akihiro
    • Journal Title

      Semiconductor Science and Technology

      Volume: 34 Issue: 2 Pages: 025001-025001

    • DOI

      10.1088/1361-6641/aaf7aa

    • NAID

      120006783664

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Persistent High Polarization of Excited Spin Ensembles During Light Emission in Semiconductor Quantum-Dot-Well Hybrid Nanosystems2018

    • Author(s)
      Takeishi Kazuki, Hiura Satoshi, Takayama Junichi, Itabashi Kodai, Urabe Masayuki, Washida Akihiro, Kiba Takayuki, Murayama Akihiro
    • Journal Title

      Physical Review Applied

      Volume: 10 Issue: 3

    • DOI

      10.1103/physrevapplied.10.034015

    • NAID

      120006529650

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Interdot spin transfer dynamics in laterally coupled excited spin ensemble of high-density InGaAs quantum dots2018

    • Author(s)
      Hiura Satoshi, Takeishi Kazuk, Urabe Masayuki, Itabashi Kodai, Takayama Junichi, Kiba Takayuki, Sueoka Kazuhisa, Murayama Akihiro
    • Journal Title

      Applied Physics Letters

      Volume: 113 Issue: 2

    • DOI

      10.1063/1.5022641

    • NAID

      120006650533

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Spin-conserved electron transport to InGaAs quantum dots through GaAs/AlGaAs superlattice2019

    • Author(s)
      S. Hiura, J. Takayama, T. Kiba, and A. Murayama
    • Organizer
      Compound Semiconductor Week 2019 (CSW2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] InGaAs量子ドットの結合励起状態におけるドット間スピンダイナミクスの温度依存性2019

    • Author(s)
      佐藤 紫乃, 樋浦 諭志, 高山 純一, 村山 明宏
    • Organizer
      第54回応用物理学会北海道支部/第15回日本光学会北海道支部合同学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Temperature Dependence of Interdot Spin Dynamics in Laterally Coupled InGaAs Quantum Dots2018

    • Author(s)
      S. Sato, S. Hiura, J. Takayama, and A. Murayama
    • Organizer
      31st International Microprocesses and Nanotechnology Conference (MNC 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temperature-Persistent High Spin Polarization and Its Dynamics in InGaAs Quantum Dots Embedded in a GaAs Quantum Well2018

    • Author(s)
      M. Takishita, S. Hiura, J. Takayama, and A. Murayama
    • Organizer
      31st International Microprocesses and Nanotechnology Conference (MNC 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modal Gain at Excited States in High-Density InGaAs Quantum Dots Investigated by Variable Stripe Length Method2018

    • Author(s)
      A. Ohtake, S. Hiura, A. Washida, J. Takayama, and A. Murayama
    • Organizer
      31st International Microprocesses and Nanotechnology Conference (MNC 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Excited Spin Engineering of In0.5Ga0.5As Quantum Dots by an Adjacent Two-Dimensional In0.1Ga0.9As Quantum Well Potential2018

    • Author(s)
      S. Hiura, K. Takeishi, J. Takayama, T. Kiba, and A. Murayama
    • Organizer
      31st International Microprocesses and Nanotechnology Conference (MNC 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temperature-dependent spin polarization and its dynamics in InGaAs quantum dots embedded in a GaAs quantum well2018

    • Author(s)
      M. Takishita, S. Hiura, J. Takayama, and A. Murayama
    • Organizer
      2nd JSPS workshop on Japan-Sweden frontiers in photon and spin functionalities of nanomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of modal gain at excited states in high-density InGaAs quantum dots by variable stripe length method2018

    • Author(s)
      A. Ohtake, S. Hiura, J. Takayama, and A. Murayama
    • Organizer
      2nd JSPS workshop on Japan-Sweden frontiers in photon and spin functionalities of nanomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of multilayer stacking on spin dynamics at excited states of vertically coupled InGaAs quantum dots2018

    • Author(s)
      S. Saito, S. Hiura, J. Takayama, and A. Murayama
    • Organizer
      2nd JSPS workshop on Japan-Sweden frontiers in photon and spin functionalities of nanomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temperature dependence of spin dynamics at laterally coupled excited states of InGaAs quantum dots2018

    • Author(s)
      S. Sato, S. Hiura, J. Takayama, and A. Murayama
    • Organizer
      2nd JSPS workshop on Japan-Sweden frontiers in photon and spin functionalities of nanomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Electron-spin transport and spin relaxation in III-V compound semiconductor barrier layers integrated with self-assembled quantum dots2018

    • Author(s)
      A. Murayama, S. Hiura, and J. Takayama
    • Organizer
      2nd JSPS workshop on Japan-Sweden frontiers in photon and spin functionalities of nanomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Interdot spin transfer dynamics in vertically coupled InGaAs quantum dots2018

    • Author(s)
      S. Hiura, J. Takayama, T. Kiba, and A. Murayama
    • Organizer
      2nd JSPS workshop on Japan-Sweden frontiers in photon and spin functionalities of nanomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fe3O4(001)表面上炭素膜の電子状態に関する研究2018

    • Author(s)
      大見 奎人, 高田 慎, 樋浦 諭志, Subagyo Agus, 末岡 和久
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 面内磁化方向のCr探針の作製2018

    • Author(s)
      高田 慎, 大見 奎人, 樋浦 諭志, Subagyo Agus, 八田 英嗣, 末岡 和久
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] InGaAs量子ドットの結合励起状態におけるスピンダイナミクスの温度依存性2018

    • Author(s)
      佐藤 紫乃, 樋浦 諭志, 高山 純一, 村山 明宏
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] InGaAs量子ドット結合励起状態における集団的なスピンの緩和現象2018

    • Author(s)
      樋浦 諭志, 高山 純一, 木場 隆之, 村山 明宏
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Persistent high spin polarization induced by interdot spin transfer among coupled excited states of InGaAs quantum dots2018

    • Author(s)
      S. Hiura, K. Takeishi, A. Washida, J. Takayama, A. Ohtake, M. Takishita, S. Saito, and A. Murayama
    • Organizer
      The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON2018)
    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fe3O4(001)表面上の炭素吸着に関する研究2018

    • Author(s)
      大見奎人, 高田慎, 高橋聡太朗, 山崎陸, 樋浦諭志, Subagyo Agus, 末岡和久
    • Organizer
      第53回応用物理学会北海道支部/第14回日本光学会北海道支部合同学術講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Local work function measurements on H/Fe3O4(001) surface2017

    • Author(s)
      R. Yamazaki, S. Takahashi, S. Takada, K. Omi, S. Hiura, A. Subagyo, and K. Sueoka
    • Organizer
      25th International Colloquium on Scanning Probe Microscopy (ICSPM25)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of Adsorbed H Atoms on Surface and Subsurface Fe Electronic States in Magnetite Film2017

    • Author(s)
      S. Hiura
    • Organizer
      7th Annual World Congress of Nano Science & Technology-2017 (Nano-S&T-2017)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] InGaAs量子ドットにおけるスピン注入ダイナミクスに対するスピン充填効果2017

    • Author(s)
      樋浦 諭志, 武石 一紀, 浦部 晶行, 板橋 皓大, 高山 純一, 木場 隆之, 村山 明宏
    • Organizer
      第78回応用物理学会秋季学術講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] エピタキシャルCr薄膜探針の作製および評価2017

    • Author(s)
      高田 慎, 大見 奎人, 樋浦 諭志, Subagyo Agus, 八田 英嗣, 末岡 和久
    • Organizer
      第78回応用物理学会秋季学術講演会
    • Related Report
      2017 Annual Research Report
  • [Remarks] 北海道大学 大学院情報科学研究院 電子材料学研究室

    • URL

      https://www.ist.hokudai.ac.jp/labo/processing/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 北海道大学 大学院情報科学研究科 電子材料学研究室

    • URL

      https://www.ist.hokudai.ac.jp/labo/processing/

    • Related Report
      2017 Annual Research Report

URL: 

Published: 2017-08-25   Modified: 2020-03-30  

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