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KAKEN_16H04195seika.pdf
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Title |
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光制御可能な超伝導ナノ微粒子の創製
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ヒカリ セイギョ カノウナ チョウデンドウ ナノ ビリュウシ ノ ソウセイ
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Hikari seigyo kanōna chōdendō nano biryūshi no sōsei
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Design of photo-controllable superconductive nanoparticles
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栄長, 泰明
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エイナガ, ヤスアキ
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Einaga, Yasuaki
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慶應義塾大学・理工学部 (矢上) ・教授
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Research team head
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科研費研究者番号 : 00322066
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2019
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科学研究費補助金研究成果報告書
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2018
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磁性、超伝導等の物理化学的物性は、物質の界面での外場により制御できる可能性がある。研究代表者は、それまでに、可逆な光異性化を示すフォトクロミック化合物を磁性材料の界面に効果的に修飾することで、可逆な磁性の光制御を達成してきた。本研究では、この考え方を拡張し、より大きな変化の期待できるスピロピラン化合物を設計、合成し、FePtナノ粒子界面に修飾することで、室温強磁性をとても大きく可逆に制御することに成功した。さらに、アゾベンゼン化合物をスピンエレクトロニクス素子界面に修飾した新しい化合物を創製し、紫外光、可視光照射によって可逆にそのスピン軌道相互作用を制御することにも成功した。
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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研究種目 : 基盤研究 (B) (一般)
研究期間 : 2016~2018
課題番号 : 16H04195
研究分野 : 機能材料化学
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