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Creation of tunneling electro-magneto-dielectric effect of nanogranular composite films

Research Project

Project/Area Number 21K18810
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionTohoku University

Principal Investigator

Cao Yang  東北大学, 学際科学フロンティア研究所, 助教 (50804598)

Co-Investigator(Kenkyū-buntansha) 増本 博  東北大学, 学際科学フロンティア研究所, 教授 (50209459)
小林 伸聖  公益財団法人電磁材料研究所, その他部局等, 研究員 (70205475)
Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsdielectric relaxation / granular dielectrics / electric field / electron tunneling / metal-ceramic composites / charge tunneling / nanogranular composites / dielectrtic properties / magnetic field / Nanogranular structure / Magneto-dielectric / dielectric tunability / spin-dependent tunneling
Outline of Research at the Start

The recently discovered tunneling magneto-dielectric (TMD) effect as well as the dielectric tunability (i.e., tunneling electro-dielectric, TED) open a new view in multifunctional nanogranular films. In this proposal, completely new tunneling electro-magneto-dielectric properties will be explored.

Outline of Final Research Achievements

I have developed novel dielectric nanogranular materials that allow for the tuning of the dielectric relaxation frequency (fr) in the AC transport response using a DC electric field. These materials have the potential to simplify and miniaturize device structures such as RF low pass filters and antennas. The structure consists of magnetic metal nanoparticles dispersed in an insulating matrix. By applying a direct current electric field, it is possible to adjust the fr within a specific frequency range. Interestingly, increasing the electric field initially shifts the fr towards the low-frequency side before moving to the high-frequency side.
To address this issue, I developed an asymmetric electron tunneling model, which provides an explanation for the observed results. I have also theoretically investigated the dielectric properties based on the asymmetric electron tunneling model, taking into account the size difference between granular pairs.

Academic Significance and Societal Importance of the Research Achievements

This work provide insights into the electric polarisation of disordered granular solids to electric fields associated with nanometric structures, which is of importance in the field of dielectric and spintronics physics and may have application in compact filters and antennas.

Report

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

    (9 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Novel Dielectric Nanogranular Materials with an Electrically Tunable Frequency Response2023

    • Author(s)
      Yang Cao, Nobukiyo Kobayashi, Cheng Wang, Saburo Takahashi, Sadamichi Maekawa, Hiroshi Masumoto
    • Journal Title

      Advanced Electronic Materials

      Volume: 14 Issue: 6 Pages: 2201218-2201218

    • DOI

      10.1002/aelm.202201218

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [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] Tunnel magnetodielectric effect: Theory and experiment2022

    • Author(s)
      Yang Cao,Nobukiyo Kobayashi,Hiroshi Masumoto
    • Journal Title

      Applied Physics Letters

      Volume: 120 Issue: 8 Pages: 82901-82901

    • DOI

      10.1063/5.0077879

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fabrication of transition metal (TM=Fe, Co) difluorides carbon nanocomposite films by magnetron co-sputtered deposition of Fe/Co and Teflon targets2021

    • Author(s)
      Yang Cao,Kenta Nogawa,Nobukiyo Kobayashi,Hiroshi Masumoto
    • Journal Title

      Applied Physics Express

      Volume: 14 Issue: 7 Pages: 75502-75502

    • DOI

      10.35848/1882-0786/ac07f0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structure and tunneling magneto-dielectric properties of Co-SrF2 nano-granular thin films2021

    • Author(s)
      Cheng Wang,Yang Cao,Nobukiyo Kobayashi,Shigehiro Ohnuma,Hiroshi Masumoto
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 8 Pages: 85224-85224

    • DOI

      10.1063/5.0058707

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Tunnel Magnetodielectric Effect Experimental and Theoretical Progress2022

    • Author(s)
      Yang Cao
    • Organizer
      Physics 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electrical control of tunnel magnetodielectric response in nanogranular films2022

    • Author(s)
      Yang Cao, Nobukiyo Kobayashi, Shigehiro Ohnuma, Hiroshi Masumoto
    • Organizer
      日本金属学会(2022年秋)
    • Related Report
      2022 Annual Research Report
  • [Presentation] Tunable Tunneling Magneto-Dielectric Response via Heterostructure Routes2021

    • Author(s)
      Yang Cao
    • Organizer
      Global Summit on Condensed Matter Physics (CONMAT2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Tunneling magneto-dielectric response in nanogranular films: Theoretical and experimental studies2021

    • Author(s)
      Yang Cao, Nobukiyo Kobayashi, Shigehiro Ohnuma, Hiroshi Masumoto
    • Organizer
      Material Research Meeting 2021 (MRM2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-07-13   Modified: 2024-01-30  

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