| 研究課題/領域番号 |
19K15285
|
|---|
| 研究機関 | 東北大学 |
|---|
研究代表者 |
曹 洋 東北大学, 学際科学フロンティア研究所, 助教 (50804598)
|
|---|
| 研究期間 (年度) |
2019-04-01 – 2021-03-31
|
| キーワード | nanogranular films / Composition-gradient / Dielectric properties / Magneto-dielectric |
|---|
| 研究実績の概要 |
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.
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
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.
|
| 今後の研究の推進方策 |
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.
|
