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Study on magnetism at conducting interfaces in nonmagnetic oxides

Research Project

Project/Area Number 26390059
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionTohoku University

Principal Investigator

Nojima Tsutomu  東北大学, 金属材料研究所, 准教授 (80222199)

Research Collaborator OUCHI Takumi  
TANAKA Shun  
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords酸化物エレクトロニクス / 電界効果 / 電気二重層トランジスタ / 2次元電子系 / スピン軌道相互作用 / スピン-軌道相互作用
Outline of Final Research Achievements

We studied magnetic properties of two dimensional electron systems at SrTiO3 (001) surfaces,which were induced by electric field in the electric double layer transistor (EDLT) device configurations. While SrTiO3 is a well-known nonmagnetic oxide in bulk, the surface electron system of it with the carrier densities higher than 0.15 per one unit cell area shows the anisotropic magnetoresistance and the planar Hall effects, which are usually observed in ferromagnetic thin films. Through the detailed measurements of magnetization and in-plane anisotropy of magnetotransports, controlled by the gate voltage in the EDLT devices, we found that the observed magnetic properties do not caused by the ferromagnetic order but results from the spin alignment phenomena with a special spin texture, originating from a Rashba-type spin-orbit coupling enhanced with multi-orbital hybridization effect in Ti-3d electrons.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (19 results)

All 2017 2016 2015

All Presentation (19 results) (of which Int'l Joint Research: 10 results,  Invited: 8 results)

  • [Presentation] SrTiO3電場誘起伝導表面におけるスピン軌道相互作用の電場制御II2017

    • Author(s)
      大内拓, 田中駿, 岩佐義宏, 野島勉
    • Organizer
      日本物理学会 第72回年次大会
    • Place of Presentation
      大阪大学豊中キャンパス(大阪府豊中市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] バックゲートを用いたSrTiO3 電場誘起伝導表面におけるスピン軌道相互作用の制御2016

    • Author(s)
      大内拓, 田中駿, 岩佐義宏, 野島勉
    • Organizer
      第132回 金属材料研究所 講演会
    • Place of Presentation
      東北大学(宮城県仙台市)
    • Year and Date
      2016-11-24
    • Related Report
      2016 Annual Research Report
  • [Presentation] In-plane magnetotransport anisotropy tuned by electric-field in liquid-gated SrTiO3 surfaces2016

    • Author(s)
      T. Nojima, S. Tanaka, T. Ouchi, and Y. Iwasa
    • Organizer
      International symposium on revolutionary atomic-layer materials
    • Place of Presentation
      Tohoku University (Sendai, Japan)
    • Year and Date
      2016-10-21
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] SrTiO3電場誘起伝導表面におけるスピン軌道相互作用の電場制御2016

    • Author(s)
      大内拓, 田中駿, 小野新平, 岩佐義宏, 野島勉
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学角間キャンパス(石川県金沢市)
    • Year and Date
      2016-09-13
    • Related Report
      2016 Annual Research Report
  • [Presentation] Modulation of Spin-Orbit Interaction in SrTiO3 Electric Double Layer Transistor Using Back Gate2016

    • Author(s)
      T. Ouchi, S. Tanaka, T. Nojima, and Y. Iwasa
    • Organizer
      Summit of Materials Science 2016 (SMS2016)
    • Place of Presentation
      Tohoku University (Sendai, Japan)
    • Year and Date
      2016-05-18
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Anomalous Magnetotransport Properties in Electric-Field-Induced Superconductors: Metallic Ground State and Enhanced In-Plane Upper Critical Field2016

    • Author(s)
      T. Nojima
    • Organizer
      International Conference on Superconductivity and Magnetism (ICSM2016)
    • Place of Presentation
      Fethiye (Turkey)
    • Year and Date
      2016-04-24
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Enhanced upper critical fields in electric-field-induced superconductors: Protection of Cooper-pairs by spin-orbit interactions2016

    • Author(s)
      T. Nojima
    • Organizer
      International Workshop on Superconductivity and Related Functional Materials 2016 (IWSFM2016)
    • Place of Presentation
      Sendai, Japan
    • Year and Date
      2016-03-17
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Carrier Density Dependence of Magnetoresistance in SrTiO3 Electric Double Layer Transistors2016

    • Author(s)
      T. Ouchi, S. Tanaka, T. Nojima, and Y. Iwasa
    • Organizer
      International Workshop on Superconductivity and Related Functional Materials 2016 (IWSFM2016)
    • Place of Presentation
      Sendai, Japan
    • Year and Date
      2016-03-17
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effect of spin-orbit coupling induced by electric field in liquid-gated surfaces of SrTiO3 & MoS22016

    • Author(s)
      T. Nojima
    • Organizer
      Mini-workshop on oxides and related materials
    • Place of Presentation
      Sendai, Japan
    • Year and Date
      2016-02-24
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of Rashba Spin-Orbit Interaction on Magnetotransport properties of Ion Liquid-Gated SrTiO32015

    • Author(s)
      T. Nojima
    • Organizer
      CEMS Topical Meeting on Emergent 2D Materials
    • Place of Presentation
      Wako, Japan
    • Year and Date
      2015-12-11
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Carrier Density Dependence of Magnetoresistance in SrTiO3 Electric Double Layer Transistors2015

    • Author(s)
      T. Ouchi, S. Tanaka, T. Nojima, and Y. Iwasa
    • Organizer
      CEMS Topical Meeting on Emergent 2D Materials
    • Place of Presentation
      Wako, Japan
    • Year and Date
      2015-12-11
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] スピン軌道相互作用に保護された電場誘起超伝導体の上部臨界磁場2015

    • Author(s)
      野島 勉,田中 駿,斎藤 優,中村康晴,大内 拓,Mohammad S. Bahramy,小濱芳允,叶 劍挺,笠原 裕一,中川 裕治,恩河 大,徳永将史,柳瀬陽一,岩佐義宏
    • Organizer
      第23回渦糸物理国内会議「超伝導体における渦糸状態の物理と応用(2015) 」
    • Place of Presentation
      休暇村志賀島,福岡市
    • Year and Date
      2015-12-07
    • Related Report
      2015 Research-status Report
  • [Presentation] SrTiO3電気二重層トランジスタにおける磁気抵抗とスピン軌道相互作用2015

    • Author(s)
      大内 拓, 野島 勉, 田中 駿, 中村 慎太郎, 岩佐 義宏
    • Organizer
      第130回東北大学金属材料研究所講演会
    • Place of Presentation
      東北大学金属材料研究所,仙台市
    • Year and Date
      2015-11-25
    • Related Report
      2015 Research-status Report
  • [Presentation] 電気二重層トランジスタの多機能性を用いた新奇超伝導の研究2015

    • Author(s)
      野島勉
    • Organizer
      2015年度冬学期第1回駒場物性セミナー
    • Place of Presentation
      東京大学駒場キャンパス,東京都
    • Year and Date
      2015-10-16
    • Related Report
      2015 Research-status Report
    • Invited
  • [Presentation] SrTiO3電気二重層トランジスタにおける磁気抵抗とスピン軌道相互作用2015

    • Author(s)
      大内拓, 野島勉, 田中駿, 中村慎太郎, 岩佐義宏
    • Organizer
      日本物理学会 2015年秋季大会
    • Place of Presentation
      関西大学千里山キャンパス,吹田市
    • Year and Date
      2015-09-15
    • Related Report
      2015 Research-status Report
  • [Presentation] Effect of Spin-Orbit Coupling Induced by Electric Field in Liquid-Gated SrTiO3 Surfaces2015

    • Author(s)
      T. Nojima
    • Organizer
      2015 EMN Qingdao Meeting
    • Place of Presentation
      Qingdao, China
    • Year and Date
      2015-06-14
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] SrTiO3電界誘起界面におけるスピン軌道相互作用の観測2015

    • Author(s)
      大内拓、田中駿、野島勉、中村慎太郎、岩佐義宏
    • Organizer
      第129回東北大学金属材料研究所講演会
    • Place of Presentation
      東北大学金属材料研究所,仙台市
    • Year and Date
      2015-05-29
    • Related Report
      2015 Research-status Report
  • [Presentation] Metallic ground states and enhanced upper critical fields in electric-field-induced superconductors2015

    • Author(s)
      T. Nojima
    • Organizer
      15th International Workshop on Vortex Matter in Superconductors (VORTEX2015)
    • Place of Presentation
      El Escorial, Spain
    • Year and Date
      2015-05-10
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] SrTiO3のオーバードープ領域における電界誘起超伝導と特異な磁気輸送特性2015

    • Author(s)
      田中駿,大内拓,中村慎太郎,岩佐義宏,野島勉
    • Organizer
      日本物理学会 第70回年次大会
    • Place of Presentation
      早稲田大学早稲田キャンパス
    • Year and Date
      2015-03-21 – 2015-03-24
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2018-03-22  

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