Development of wide-frequency band and high-frequency tunneling magneto-dielectric effect in gradient granular structure
| Project/Area Number |
19K15285
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 26020:Inorganic materials and properties-related
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| Research Institution | Tohoku University |
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Principal Investigator |
Cao Yang 東北大学, 学際科学フロンティア研究所, 助教 (50804598)
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | composition-gradient / broadband frequency / magneto-dielectric / Si dopant / dielectric enhanment / Composition-gradient / large enhancement / dielectric properties / nanogranular films / Dielectric properties / Magneto-dielectric / Granular nanostructure / Gradient distribution / tunnel magnetodielectric / high-frequency response |
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| Outline of Research at the Start |
In 2014, we discover a tunneling magneto-dielectric (TMD) effect in nanocomposites based on a completely new mechanism of spin-dependent quantum tunneling phenomenon. From the practical viewpoint,wide-frequency band, high-frequency TMD effect is very demanding. Here, to achieve this objective, I propose a granular-Functional Gradient Materials with wide distribution of inter-granular spacing.
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| Outline of Final Research Achievements |
Tunnelling magneto-dielectric (TMD) effect in nanocomposites discovered by our group in 2014 features a narrow peak of the maximum dielectric variations. This limits its magnetoelectric application over a wide frequency range. From the practical viewpoint, it is highly demanded to develop the broadband TMD response. In this research, I have proposed and fabricated a composition-gradient multilayer nanogranular structure that can exhibit a broadband TMD effect up to megahertz frequency range. Additionally, I have realized the unprecedented high TMD response of up to 8.5% with small addition of Si into the conventional nanogranular films.
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| Academic Significance and Societal Importance of the Research Achievements |
This research results may have potential in practical high-frequency band device applications in such as 5G cell phones as well as other high-frequency mobile devices.
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Report
(3 results)
Research Products
(11 results)
