Development of wide-frequency band and high-frequency tunneling magneto-dielectric effect in gradient granular structure

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15285
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Tohoku 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)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: composition-gradient / broadband frequency / magneto-dielectric / Si dopant / dielectric enhanment

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.

Free Research Field

Magnetic and dielectric films

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.