2019 Fiscal Year Research-status Report
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 Institution | Tohoku University |
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Principal Investigator |
曹 洋 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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| Keywords | nanogranular films / Composition-gradient / Dielectric properties / Magneto-dielectric |
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| Outline of Annual Research Achievements |
I have fabricated the composition-graded granular (CGG) nanostructure of Co-MgF by magnetron sputtering technique. The CGG films exhibit the dielectric responses with distinct dielectri relaxation process compared with the conventional uniform Co-MgF films. Further, upon the magnetic field, the proposed CGG films show the tunneling magneto-dielectric (TMD) properties with a flatten peak at particular frequency position, while maintaining high dielectric variations.The relationship between the gradient distribution and TMD properties was clarified. This dielectric and TMD differences results from the wide distribution of granules in the matrix, which proves the key role of granular distribution in the regulation of TMD properties.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The objective of this proposal is to propose the composition-graded granular (CGG) nanostructrue with wide-freqeuncy band tunneling magneto-dielectric (TMD) properties. This year, I have sucessfully constructed the CGG films by controlling the sputtering rate of different targets. Moreover, the CGG films indeed show high dielectric and TMD responses at high-frequency side, which is more smooth than initially planned.
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| Strategy for Future Research Activity |
I will 1) perform theoretical calculations on the results and give the theoretical explanation on the differences between the CGG and uniform granular films and 2) explore other granular materials systems to prove the generality of the newly proposed composition-graded nanostructure.
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