| Project/Area Number |
15H03981
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | Hokkaido University |
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Principal Investigator |
Kaiju Hideo 北海道大学, 電子科学研究所, 准教授 (70396323)
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| Co-Investigator(Kenkyū-buntansha) |
西井 準治 北海道大学, 電子科学研究所, 教授 (60357697)
長浜 太郎 北海道大学, 工学研究院, 准教授 (20357651)
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| Co-Investigator(Renkei-kenkyūsha) |
KOMINE Takashi 茨城大学, 工学部, 准教授 (90361287)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
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| Keywords | スピントロニクス / 磁性ナノ薄膜 / 誘電体 / 交流インピーダンス特性 / 磁性薄膜 / ナノ構造 / マイクロ・ナノデバイス / スピンエレクトロニクス / 表面・界面物性 / 誘電体物性 / 省エネルギー / 強磁性トンネル接合 / 磁気キャパシタンス効果 |
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| Outline of Final Research Achievements |
Spintronics, which is an emerging research field utilizing the charge and spin degrees of freedom of electrons, has received much attention due to the next-generation technology that provides new functionalities in conventional electronics. In this study, we fabricate spintronic devices, in which a thin insulating layer is sandwiched between magnetic thin-film layers, and investigate magnetocapacitance effect. As a result, we successfully observe the highest magnetocapacitance ratio of 155%, which is three times larger than the conventional value (=50%). The experimental results can be quantitatively explained by a newly proposed theoretical calculation based on Debye-Frohlich model. Since this calculation suggests that the magnetocapacitance ratio can reach 1000%, the further development will be made in near future.
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