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DC-AC hybrid-type tunneling thin films with aligned nano particles

Research Project

Project/Area Number 21K14482
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 28020:Nanostructural physics-related
Research InstitutionTohoku University

Principal Investigator

Aoki Hanae  東北大学, 工学研究科, 講師 (60733920)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywordsナノ複相膜 / 磁性ナノ粒子 / トンネル磁気抵抗効果 / トンネル磁気誘電効果 / 形状磁気異方性 / ナノグラニュラー薄膜
Outline of Research at the Start

電子デバイスには、直流あるいは交流動作の素子がそれぞれ別々に近接して使用されており、消費電力の増加やノイズ干渉の原因となっている。もし直流-交流動作をハイブリッドする素子があれば、電子デバイスの低電力化・低ノイズ・高密度化が期待できる。
磁性ナノ粒子がセラミクス中に分散したナノグラニュラー薄膜は、直流動作のトンネル磁気抵抗効果が発現することで知られるが、最近、新しく交流動作のトンネル磁気誘電効果が発現することも見出された。本研究では、従来のナノグラニュラー膜ではバラつきがあるナノ粒子を膜の縦と横に異なる間隔で配列し、縦に交流、横に直流の独立したトンネル効果の同時発現に挑戦する。

Outline of Final Research Achievements

To realize a DC-AC hybrid tunneling effect in the same thin film, I have fabricated “lateral” and “vertical” nanogranular film in which the metal magnetic particles are densely aligned in the in-plane and out-of-plane direction, respectively. For the lateral films, the spacing between particles in the thickness direction can be controlled from 0.3 to 2.1 nm, while the spacing between particles in the in-plane direction is in the range of 0.5 to 1.0 nm. Then those structural modulations can control both in- and out-of-plane conduction levels by small (large) particle spacing, which is effective for the fabrication of flexible DC-AC hybrid tunneling films.

Academic Significance and Societal Importance of the Research Achievements

複数の異なる電流・電圧が制御可能なナノスケール構造体の開発は集積化への可能性から注目を集めている。本研究では、自己組織化するナノ複相膜において磁性金属粒子を数nmオーダーで配列させることに成功し、横に直流、縦に交流の異なるトンネル電子が寄与することを見出した。磁界依存するトンネル電子を媒体とすることで、縦横の誘電率および電気比抵抗をそれぞれ4%程度、磁界で制御可能なことを見出した。また、磁気的孤立を保ったまま、粒子形状を扁平・扁長にすることで、長軸方向に磁気異方性を付与できる形状磁気異方性の効果も実証した。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (21 results)

All 2023 2022 2021 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (12 results) (of which Int'l Joint Research: 6 results) Book (1 results) Remarks (5 results)

  • [Journal Article] Tunneling Magnetodielectric Effect in Co–Al<sub>2</sub>O<sub>3</sub> Granular Films2022

    • Author(s)
      Moe Kimura, Yang Cao, Hanae Kijima-Aoki, Nobukiyo Kobayashi, Shigehiro Ohnuma, Hiroshi Masumoto
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 63 Issue: 12 Pages: 1677-1681

    • DOI

      10.2320/matertrans.MT-M2022098

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2022-12-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] DC and AC tunneling magnetoelectric responses of cobalt lateral nanogranular2022

    • Author(s)
      Hanae Kijima-Aoki, Shigehiro Ohnuma, Nobukiyo Kobayashi, Hiroshi Masumoto
    • Journal Title

      Journal of Magnetism and Magnetic Materials

      Volume: 547 Pages: 168890-168890

    • DOI

      10.1016/j.jmmm.2021.168890

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Shape effect of Co nanoparticles on the electric and magnetic properties of Co-SiO2nanogranular films2022

    • Author(s)
      Kijima-Aoki, Hanaea Endo Yasushi, Miyazaki Takamichi, Nojima Tsutomu, Ikeda Kenji, Kobayashi Nobukiyo, Ohnuma Shigehiro, Masumoto Hiroshi
    • Journal Title

      AIP Advances

      Volume: 12 Issue: 3 Pages: 35229-35229

    • DOI

      10.1063/9.0000310

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 光周波数帯の誘電特性に及ぼすCo-BaF2ナノ複相膜のCo添加量の効果2023

    • Author(s)
      青木英恵、池田賢司、小林伸聖、増本博、遠藤恭
    • Organizer
      日本金属学会春季講演大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Magnetic nanopillars in self-organized magneto-dielectric nanocomposite thin films2023

    • Author(s)
      Hanae Kijima-Aoki, Hiroshi Masumoto, Yasushi Endo
    • Organizer
      Intermag2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improving magnetic and dielectric performance of Co-BaMgF4 nanocomposite films by thermal annealing treatment2023

    • Author(s)
      Nozomi Yokohama, Hanae Kijima-Aoki, and Hiroshi Masumoto
    • Organizer
      Intermag2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Faraday effects of magneto-dielectric nanogranular films with various particle shape2023

    • Author(s)
      Hanae Kijima-Aoki, Kenji Ikeda, Nobukiyo Kobayashi, Masato Ohnuma, Yoshiki Honda, and Hiroshi Masumoto
    • Organizer
      Intermag2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Shape effect of cobalt nano-particles on magnetic properties of Co-SiO2 nano-granular films.2022

    • Author(s)
      H. Kijima-Aoki, Y. Endo, T. Miyazaki, T. Nojima, K. Ikeda, N. Kobayashi, S. Ohnuma and H. Masumoto
    • Organizer
      Joint intermag-MMM2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Relationship between morphology and soft-magnetic properties of Co-Sr-F nano-granular films2022

    • Author(s)
      C. Wang, Y. Endo, Y. Cao, H. Kijima-Aoki, N. Kobayashi, S. Ohnuma and H. Masumoto
    • Organizer
      Joint intermag-MMM2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 小角散乱法を用いたナノグラニュラー膜の構造とトンネル伝導の関係2022

    • Author(s)
      青木英恵、本田祥基、大沼正人、小林伸聖、大沼繁弘、増本博
    • Organizer
      日本金属学会秋季講演大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Shape effect of cobalt nano-particles on magnetic properties of Co-SiO2 nano-granular films2022

    • Author(s)
      H. Kijima-Aoki,Y. Endo,T. Miyazaki,T. Nojima,K. Ikeda,N. Kobayashi,S. Ohnuma,H. Masumoto
    • Organizer
      2022 Joint MMM-Intermag conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 小角散乱法を用いたナノグラニュラー膜の構造とトンネル伝導の関係2022

    • Author(s)
      青木英恵、本田祥基、大沼正人、小林伸聖、大沼繁弘、増本博
    • Organizer
      日本金属学会2022年春季(第169回)講演大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 粒子形状を制御したナノグラニュラー膜の 巨大保磁力発現機構の検討2021

    • Author(s)
      青木英恵,打越雄央,曹洋,川井哲郎,野島勉,遠藤恭,大沼繁弘,増本博
    • Organizer
      マグネティクス研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Co-SiO2ナノグラニュラー膜の 低温磁気特性におよぼす粒子形状の効果2021

    • Author(s)
      青木英恵,曹洋,野島勉,大沼繁弘,小林伸聖,増本博
    • Organizer
      日本金属学会2021年秋期(第168回)講演大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ナノ粒子を扁平化したナノグラニュラー膜の 粒子形状が及ぼす強磁性・超常磁性への影響2021

    • Author(s)
      青木英恵,打越雄央,大沼繁弘,小林伸聖,増本博
    • Organizer
      第45回日本磁気学会学術講演会
    • Related Report
      2021 Research-status Report
  • [Book] Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-composites2021

    • Author(s)
      Alejandro G. RocaPaolo MeleHanae Kijima-AokiElvira FantechiJana K. VejpravovaMartin KalbacSatoru KanekoTamio Endo
    • Total Pages
      287
    • Publisher
      Springer, Cham
    • ISBN
      9783030740726
    • Related Report
      2021 Research-status Report
  • [Remarks] トピックス 青木英恵助教 論文掲載

    • URL

      https://www.fris.tohoku.ac.jp/feature/topics/detail---id-1041.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 青木英恵講師が 第33回 (令和4年度) トーキン科学技術賞 を受賞

    • URL

      https://www.ecei.tohoku.ac.jp/ecei_web/information/2022/20230330.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 日本磁気学会第28回公開講演会において青木英恵講師が講演を行いました

    • URL

      https://www.ecei.tohoku.ac.jp/ecei_web/information/2022/20220829.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 女子高生の実践的研究者体験プログラム「マテジョLABO」

    • URL

      http://www2.fris.tohoku.ac.jp/~aoki/

    • Related Report
      2022 Annual Research Report
  • [Remarks] マテジョ LABO公開講座(2022.8)

    • URL

      https://arim.imr.tohoku.ac.jp/%E3%83%9E%E3%83%86%E3%82%B8%E3%83%A7-labo%E5%85%AC%E9%96%8B%E8%AC%9B%E5%BA%A7%EF%BC%882022-8%EF%BC%89

    • Related Report
      2022 Annual Research Report

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Published: 2021-04-28   Modified: 2024-01-30  

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