Design of photo-controllable superconductive nanoparticles
| Project/Area Number |
16H04195
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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 |
Organic and hybrid materials
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| Research Institution | Keio University |
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Principal Investigator |
EINAGA Yasuaki 慶應義塾大学, 理工学部(矢上), 教授 (00322066)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2018: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
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| Keywords | フォトクロミック材料 / 光制御 / 界面 / 磁性 / 超伝導 / フォトクロミズム / 界面物性 / 薄膜 / 微粒子 / 表面・界面物性 / 超伝導材料・素子 / 光スイッチ |
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| Outline of Final Research Achievements |
We report preparation of a photoswitchable room-temperature ferromagnetic material using FePt nanoparti-cles protected with a photochromic spiropyran ligand. It showed room-temperature ferromagnetism and reversible switching of magnetization by 60% upon photochromic reaction of the spiropyran ligand. This gigantic pho-tomagnetic effect is explained as spiropyran’s large change in the dipole moment during photochromic reaction that tunes the magnitude of electron transfer at the interface. Furthermore, we demonstrate that magnetoresistance and voltage generation originating from the spin-charge conversion in metallic heterostructures can be manipulated by decorating the surface with selfassembled organic monolayers through the cooperative molecular field effect. We also demonstrate reversible phototuning of the spin-charge conversion through light-driven molecular transformations using a molecule that can photoisomerize between the trans and cis states.
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| Academic Significance and Societal Importance of the Research Achievements |
現在利用されている磁性材料、超伝導材料等の物性を光で制御できることは、光エネルギーの有効利用、光の有効な特性を利用した新しい機能材料の開発という点で有意義である。特に、スピンに関連する物性を可逆に光で制御できる材料は、学術的にも世界的に盛んに研究開発されており、社会的にもその開発が待たれている。例えば、本研究で示した、室温強磁性における磁性の可逆な光制御は、「室温」で実現したという点で、学術的観点はもちろん、実用材料への展開まで期待される。一方、化学的手法によるスピン軌道相互作用の光制御は、これまでに報告例がなく、スピントロニクス分野にとって学術的意義が大きい。
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Report
(4 results)
Research Products
(17 results)
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[Journal Article] Charge-Transfer Phase Transition of a Cyanide-Bridged FeII/FeIII Coordination Polymer2016
Author(s)
Kuirun Zhang, Soonchul Kang,* Zi-shuo Yao, Kazusa Nakamura, Takashi Yamamoto, Yasuaki Einaga, Nobuaki Azuma, Yuji Miyazaki, Motohiro Nakano, Shinji Kanegawa, Osamu Sato*
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Journal Title
Angew. Chem. Int. Ed.
Volume: 55
Issue: 20
Pages: 6047-6050
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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