Novel spin filter function using graphene nanoribbon
| Project/Area Number |
19K21850
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 13:Condensed matter physics and related fields
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2019-06-28 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Keywords | グラフェン / ナノリボン / トポロジー / スピンフィルタ / スピントロニクス |
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| Outline of Research at the Start |
本研究課題では、グラフェン1次元鎖（ナノリボン）に生じる「グラフェン端状態」を用いて、スピントロニクスにこれまでなかったスピンフィルタ機能を実現する。これにより、スピントロニクスにスピン抽出というこれまでになかった機能を付与できる。さらに、物性物理の基本問題である1次元強磁性鎖を初めて実証できる。本研究課題が達成されれば、スピントロニクス及びトポロジー物理の分野に新潮流を作り出すことができる。
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| Outline of Final Research Achievements |
In this work, we aimed to develop spin filter function using one-dimensional graphene chain, i.e., graphene nanoribbon. If the edges have zigzag shape, spin polarized states are realized at the edges. In such a case, spin filter function can be added by doping holes in graphene and applying a tiny magnetic field. For this purpose, we tried to fabricate graphene nanoribbons in between hexagonal defects which can be formed by irradiating oxygen and hydrogen plasma. However, it turned out that a high-resolution atomic force microscopy was needed to confirm the edge shape. Thus, we performed magnetotransport measurements for the irradiated graphene sample. A clear weak localization peak was observed near zero magnetic field. This peak increases with increasing the irradiation time.
In future, we will try to make graphene nanoribbons with a width of less than 100 nm and fabricate spin filter devices where spin states can be selectively tuned by gating.
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| Academic Significance and Societal Importance of the Research Achievements |
今後は幅100 nm以下のグラフェンナノリボンの作製、さらには電界効果を用いて、スピンフィルタ機能を付与したデバイスの作製に挑戦する。同様の機能は「電界効果スピントランジスタ」としてダッタとダスが提案しているが、未だ実現できてない。グラフェンナノリボンでスピンフィルタを実現できれば、1次元フラットバンド強磁性という未だ実証されていない物性物理の基本問題に答えるだけでなく、スピン抽出という新機能をスピントロニクスデバイスに付与できる。
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Report
(3 results)
Research Products
(76 results)
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[Journal Article] Shubnikov-de-Haas oscillation and possible modification of effective mass in CeTe3 thin films2021
Author(s)
Mori Watanabe, Ryoya Nakamura, Sanghyun Lee, Takuya Asano, Takashi Ibe, Masashi Tokuda, Hiroki Taniguchi, Daichi Ueta, Yoshinori Okada, Kensuke Kobayashi, and Yasuhiro Niimi
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Journal Title
AIP Advances
Volume: 11
Issue: 1
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Spin treacle in a frustrated magnet observed with spin current2020
Author(s)
Hiroki Taniguchi,Mori Watanabe,Takashi Ibe, Masashi Tokuda, Tomonori Arakawa,Toshifumi Taniguchi, Bo Gu,Timothy Ziman, Sadamichi Maekawa, Kensuke Kobayashi,and Yasuhiro Niimi
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Journal Title
Physical Review B
Volume: 102
Issue: 9
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Tunneling mechanism in a (Ga,Mn)As/GaAs based spin Esaki diode investigated by bias-dependent shot noise measurements2020
Author(s)
T. Arakawa, J. Shiogai, M. Maeda, M. Ciorga, M. Utz, D. Schuh, Y. Niimi, M. Kohda, J. Nitta, D. Bougeard, D. Weiss, and K. Kobayashi
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Journal Title
Physical Review B
Volume: 102
Issue: 4
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Spin transport measurements in metallic Bi/Ni nanowires2019
Author(s)
Masashi Tokuda, Natsuki Kabeya, Komei Iwashita, Hiroki Taniguchi, Tomonori Arakawa, Di Yue, Xinxin Gong, Xiaofeng Jin, Kensuke Kobayashi, and Yasuhiro Niimi
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Journal Title
Applied Physics Express
Volume: 印刷中
Issue: 5
Pages: 053005-053005
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] カイラル磁性体CrNb3S6薄膜のスピン輸送測定2019
Author(s)
川原遼馬, 谷口祐紀, 河上司, Y. A. Alaoui, 荒川智紀, 乾皓人, 島本雄介, 高阪勇輔, 戸川欣彦, 小林研介, 新見康洋
Organizer
日本物理学会2019年秋季大会
Related Report
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