Spin injection to nanodiamond films

• Project/Area Number: 16K14391
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Kyushu University
• Principal Investigator: Yoshitake Tsuyoshi 九州大学, 総合理工学研究院, 准教授 (40284541)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: ナノダイヤモンド / スピンバルブ / スピン注入 / 局所配置 / 非局所配置 / スパッタリング / 同軸型アークプラズマ堆積法 / 電子線リソグラフィー / 鉄シリサイド / ダイヤモンド / 磁気抵抗効果 / リソグラフィー / スピン拡散長 / カーボン / カーボン材料 / ナノ材料

Outline of Final Research Achievements

The spin diffusion length in nano diamond was investigated iun this work. After an Fe3Si layer is epitaxially grown on a Si (111) substrate by sputtering, an ultrananocrystalline diamond (UNCD) film is deposited by coaxial arc plasma deposition, and an Fe layer is deposited by sputtering on the top layer. For the resultant Fe/60 nm UNCD/Fe3Si structure, spin valve signals corresponding to parallel and antiparallel alignments between the ferromagnetic layers were observed at room temperature. We also realized the fabrication of a lateral-type spin valve device by lift-off method using electron beam lithography, and succeeded in observing spin valve signals in local arrangement.

Academic Significance and Societal Importance of the Research Achievements

原子番号が小さいほどスピン軌道相互作用は小さく，軽元素ほど長いスピン拡散長が期待され，カーボンから成るグラフェンやカーボンナノチューブが1 μm以上のスピン拡散長を期待されて活発に研究されているが，ダイヤモンド系材料に関する研究はまだ殆ど無かった．そこで，ナノダイヤモンド(NCD)半導体を中間層としたスピンバルブ素子を作製して，ナノダイヤモンド内のスピン拡散長を明らかにすることを目的として研究を行った．マスク法により縦型構造の，電子線リソグラフィーを用いて横型構造のスピンバルブ素子の作製を実現して，スピンバルブ信号の観測に成功した．ダイヤモンドのスピントロニクスへの展開の第一歩といえる．

Research Products

• [Journal Article] Fabrication of lateral-type spin-valve comprising FeSi2 spin-transfer layers by electron beam lithography (2019)
  • Author(s): Hiroki Ishimoto, Kazuki Kudo, Tetsuo Tabei, Kazushi Okada, Shinji Yamada, Tadashi Sato, Ken-ichiro Sakai, and Tsuyoshi Yoshitake
  • Journal Title: J. Phys. Conf. Series Volume: -
  • Peer Reviewed
• [Journal Article] Fabrication of lateral-type spin-valve comprising FeSi2 spin-transfer layers by electron beam lithography (2018)
  • Author(s): Hiroki Ishimoto, Kazuki Kudo, Tetsuo Tabei, Kazushi Okada, Shinji Yamada, Tadashi Sato, Ken-ichiro Sakai, and Tsuyoshi Yoshitake
  • Journal Title: J. Phys. Conf. Series Volume: in press
  • Peer Reviewed
• [Journal Article] Structural Evaluations of Fe/Boron-Doped Carbon/Fe3Si Spin-Valve Junctions (2017)
  • Author(s): Kazuki Kudo, S. Takeichi, K. Nakashima, K. Sakai, M. Nishijima and T. Yoshitake
  • Journal Title: 11th International Symposium on Atomic Level Characterizations for New Materials and Devices ’17 (ALC17) Proceedings Volume: 1 Pages: 64-66
• [Journal Article] Magnetoresistance Effects in Spin-Valves Comprising N-Doped Carbon Interlayers (2017)
  • Author(s): Kazuki Kudo, S. Takeichi, K. Nakashima, K. Sakai and T. Yoshitake
  • Journal Title: 11th International Symposium on Atomic Level Characterizations for New Materials and Devices ’17 (ALC17) Proceedings Volume: 1 Pages: 79-81
• [Journal Article] Magnetoresistance effects in Fe/nanodiamond/Fe3Si trilayered junctions at room temperature (2017)
  • Author(s): Kazuki Kudo, Satoshi Takeichi, Kazutoshi Nakashima, Ken-ichiro Sakai,and Tsuyoshi Yoshitake
  • Journal Title: Proceedings of the Cross Straits Symposium on Energy and Environmental Science and Technology Volume: 1 Pages: 202-203
• [Journal Article] Film Structures of Fe/B-doped Carbon/Fe3Si Spin Valve Junctions (2017)
  • Author(s): Kazuki Kudo, Kazutoshi Nakashima, Satoshi Takeichi, Rezwan Ahmed, Seigi Mizuno, Ken-ichiro Sakai, Masahiko Nishijima, and Tsuyoshi Yoshitake
  • Journal Title: JJAP Conference Proceedings Volume: 5 Pages: 011502-011502
  • DOI: 10.7567/jjapcp.5.011502
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Temperature-dependent Magnetoresistance Effects in Fe3Si/FeSi2/Fe3Si Trilayered Spin Valve Junctions (2017)
  • Author(s): Kazuya Ishibashi, Kazuki Kudo, Kazutoshi Nakashima, Yuki Asai, Ken-ichiro Sakai, Hiroyuki Deguchi, and Tsuyoshi Yoshitake
  • Journal Title: JJAP Conf. Proc. Volume: 5 Pages: 011501-011501
  • DOI: 10.7567/jjapcp.5.011501
  • NAID: 120006705854
  • Peer Reviewed
• [Journal Article] Spin valves comprising nitrogen-doped carbon interlayers (2016)
  • Author(s): Kazutoshi Nakashima, Kazuki Kudo, Satoshi Takeichi, Ken-ichiro Sakai, and Tsuyoshi Yoshitake
  • Journal Title: Proceedings of the 18th Cross Straits Symposium on Energy and Environmental Science & Technology Volume: 1 Pages: 45-46
  • Acknowledgement Compliant
• [Journal Article] Fabrication of spin valve junctions comprising Fe3Si/B-doped carbon/Fe trilayers (2016)
  • Author(s): Rezwan Ahmed, Kazuki Kudo, Satoshi Takeichi, Ken-ichiro Sakai, Masahiko Nishijima, Tsuyoshi Yoshitake, and Seigi Mizuno
  • Journal Title: Proceedings of the 18th Cross Straits Symposium on Energy and Environmental Science & Technology Volume: 1 Pages: 27-28
  • Acknowledgement Compliant
• [Presentation] ナノダイヤモンド半導体層から成るスピンバルブ素子の作製と評価 (2018)
  • Author(s): 坂井拓也，石本浩起，竹市悟志，工藤和樹，堺研一郎，吉武剛
  • Organizer: 平成３０年度応用物理学会九州支部学術講演会，平成３０年１２月８～９日，福岡大学七隈キャンパス
• [Presentation] 電子線リソグラフィーを利用したFe-Si系横型スピンバルブ素子の作製 (2018)
  • Author(s): 吉武剛
  • Organizer: 第３回 広島大学・山口大学・香川大学・FAIS 合同シンポジウム，平成３０年１２月４日，小倉AIMビル
• [Presentation] Structural Evaluation of Spin-Valves Comprising B-Doped Carbon Interlayers (2018)
  • Author(s): Hiroki Ishimoto, Satoshi Takeichi, Kazuki Kudo, Ken-ichiro Sakai, and Tsuyoshi Yoshitake
  • Organizer: 2018 MRS Fall Meeting & Exhibit, Nov 25 - 30, 2018, Boston, Massachusetts
• [Presentation] Spin Injection into Epitaxially-Grown β-FeSi2 in Lateral Structural Spin-Valves (2018)
  • Author(s): Hiroki Ishimoto, Tetsuo Tabei, Ken-ichiro Sakai and Tsuyoshi Yoshitake
  • Organizer: 2018 MRS Fall Meeting & Exhibit, Nov 25 - 30, 2018, Boston, Massachusetts
• [Presentation] 室温下における鉄シリサイド半導体中へのスピン流の生成 (2018)
  • Author(s): 堺 研一郎、石本 浩起、浅井 勇輝、石橋 和也、田部井 哲夫、西嶋 雅彦、吉武 剛
  • Organizer: 2018年第79回応用物理学会秋季学術講演会，2018年9月18-21日，名古屋国際会議場
• [Presentation] 電子線リソグラフィー法による横型スピンバルブ素子の創製とエピタキシャルbeta-FeSi2層への電気的スピン注入 (2018)
  • Author(s): 堺 研一郎，石本 浩起，田部井 哲夫，吉武 剛
  • Organizer: 2018年第79回応用物理学会秋季学術講演会，2018年9月18-21日，名古屋国際会議場
• [Presentation] エピタキシャルb-FeSi2層から成る横型スピンバルブ素子の作製 (2018)
  • Author(s): 坂井 拓也，石本 浩起，田部井 哲夫，堺 研一郎，吉武 剛
  • Organizer: 第１８回シリサイド系半導体・夏の学校，2018年7月21日(土)～ 22日(日)，静岡県立森林公園森の家
• [Presentation] Fabrication of lateral spinvalves comprising FeSi2 spin-transfer layers by electron beam lithography (2017)
  • Author(s): H. Ishimoto, K. Kudo, K. Sakai, and T. Yoshitake
  • Organizer: The 2nd Asian Applied Physics Conference (Asian-APC), December 1-2, 2017, Miyazaki Kanko Hotel, Miyazaki, Japan
  • Int'l Joint Research
• [Presentation] 局所2端子型スピンバルブ効果による半導体FeSi2の室温スピン輸送長に関する研究 (2017)
  • Author(s): 石本 浩起，工藤 和樹，堺 研一郎，西嶋 雅彦，吉武 剛
  • Organizer: 平成２９年度応用物理学会九州支部学術講演会，平成２９年１２月２～３日，宮崎観光ホテル，宮崎
• [Presentation] 室温下における鉄シリサイド半導体FeSi2 中への純スピン流の生成 (2017)
  • Author(s): 堺研一郎，浅井勇輝，石橋和也，西嶋雅彦，吉武剛
  • Organizer: 平成２９年度応用物理学会九州支部学術講演会，平成２９年１２月２～３日，宮崎観光ホテル，宮崎
• [Presentation] Magnetoresistance effects in spin-valves comprising N-doped carbon interlayers (2017)
  • Author(s): Kazuki Kudo, Satoshi Takeichi, Kazutoshi Nakashima, Ken-ichiro Sakai, Tsuyoshi Yoshitake
  • Organizer: 11th International Symposium on Atomic Level Characterizations for New Materials and Devices ’17 (ALC17), December 3-8), 2017, Aqua Kauai Beach Resort, Kauai, Hawaii, USA
  • Int'l Joint Research
• [Presentation] Structural evaluations of Fe/boron-doped carbon/Fe3Si spin-valve junctions (2017)
  • Author(s): Kazuki Kudo, Satoshi Takeichi, Kazutoshi Nakashima, Ken-ichiro Sakai, Masahiko, Nishijima, Tsuyoshi Yoshitake
  • Organizer: 11th International Symposium on Atomic Level Characterizations for New Materials and Devices ’17 (ALC17), December 3-8), 2017, Aqua Kauai Beach Resort, Kauai, Hawaii, USA
  • Int'l Joint Research
• [Presentation] Magnetoresistance effects in Fe/nanodiamond/Fe3Si trilayered junctions at room temperature (2017)
  • Author(s): Kazuki Kudo, Satoshi Takeichi, Kazutoshi Nakashima, Ken-ichiro Sakai,and Tsuyoshi Yoshitake
  • Organizer: Cross Straits Symposium on Energy and Environmental Science and Technology, November 29-December 1, 2017, Chikushi Campus, Kyushu University, Japan
  • Int'l Joint Research
• [Presentation] 鉄シリサイド系スピンバルブ素子によるスピン流の生成と検出 (2017)
  • Author(s): 堺 研一郎、浅井 勇輝、石橋 和也、西嶋 雅彦、吉武 剛
  • Organizer: 第７８回応用物理学会秋季学術講演会，2017年9月5-8日，福岡国際会議場・福岡国際センター・福岡サンパレスホテル，福岡
• [Presentation] Magnetoresistance effects in Fe/B-doped carbon/Fe3Si trilayered spin valve junctions (2017)
  • Author(s): Kazuki Kudo, Kazutoshi Nakashima, Satoshi Takeichi, Ken-ichiro Sakai, Masahiko Nishijima, and Tsuyoshi Yoshitake
  • Organizer: 9th International School and Conference on Spintronics and Quantum Information Technology(Spin TECH IX), Jun. 4-8, 2017, Fukuoka International Congress Center, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] Spin valve effects in trilayered films comprising nitrogen-doped carbon interlayers (2017)
  • Author(s): Satoshi Takeichi, Kazutoshi Nakashima, Kazuki Kudo, Ken-ichiro Sakai, and Tsuyoshi Yoshitake
  • Organizer: 9th International School and Conference on Spintronics and Quantum Information Technology (Spin TECH IX), 4-8th June, 2017, Fukuoka International Congress Center, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] Local and non-local structural spin valves comprising Fe3Si/FeSi2/Fe3Si trilayer films (2017)
  • Author(s): Ken-ichiro Sakai, Masahiko Nishijima, and Tsuyoshi Yoshitake
  • Organizer: 9th International School and Conference on Spintronics and Quantum Information Technology (Spin TECH IX), 4-8th June, 2017, Fukuoka International Congress Center, Fukuoka, Japan
  • Int'l Joint Research
• [Presentation] Spin valves comprising nitrogen-doped carbon interlayers (2016)
  • Author(s): Kazutoshi Nakashima, Kazuki Kudo, Satoshi Takeichi, Ken-ichiro Sakai, and Tsuyoshi Yoshitake
  • Organizer: The 18th Cross Straits Symposium on Energy and Environmental Science & Technology, Dec 4-6, 2016, Shanghai Jiao Tong University, China
  • Place of Presentation: Shanghai Jiao Tong University, China
  • Year and Date: 2016-12-04
  • Int'l Joint Research
• [Presentation] Fabrication of spin valve junctions comprising Fe3Si/B-doped carbon/Fe trilayers (2016)
  • Author(s): Rezwan Ahmed, Kazuki Kudo, Satoshi Takeichi, Ken-ichiro Sakai, Masahiko Nishijima, Tsuyoshi Yoshitake, and Seigi Mizuno
  • Organizer: The 18th Cross Straits Symposium on Energy and Environmental Science & Technology
  • Place of Presentation: Shanghai Jiao Tong University, China
  • Year and Date: 2016-12-04
  • Int'l Joint Research
• [Presentation] ナノダイヤモンド中間層からなるスピンバルブ素子の創製とその評価 (2016)
  • Author(s): 工藤 和樹, 中嶋 一敬, 竹市 悟志, 堺 研一郎, 吉武 剛
  • Organizer: 平成２８年度応用物理学会九州支部学術講演会
  • Place of Presentation: 対馬市交流センター，長崎
  • Year and Date: 2016-12-03
• [Presentation] Fe/boron-doped Ultrananocrystalline Diamond/Fe Trilayered Spin Valve Junctions (2016)
  • Author(s): Kazuki Kudo*, Satoshi Takeichi, Hirokazu Kishimoto, Ken-ichiro Sakai, Hiroyuki Deguchi, and Tsuyoshi Yoshitake
  • Organizer: Asia-Pacific Conference on Semiconducting Silicides and Related Materials Science and Technology Towards Sustainable Electronics ( APAC Silicide 2016)
  • Place of Presentation: Nishijin Plaza, Kyushu University, Fukuoka
  • Year and Date: 2016-07-16
  • Int'l Joint Research
• [Presentation] Temperature-Dependent Magnetoresistance Effects in Fe3Si/FeSi2/Fe3Si Trilayered Spin Valve Junctions (2016)
  • Author(s): Kazuki Kudo*, Kazuya Ishibashi, Kazutoshi Nakashima, Yuki Asai, Ken-ichiro Sakai, Hiroyuki Deguchi, and Tsuyoshi Yoshitake
  • Organizer: Asia-Pacific Conference on Semiconducting Silicides and Related Materials Science and Technology Towards Sustainable Electronics ( APAC Silicide 2016)
  • Place of Presentation: Nishijin Plaza, Kyushu University, Fukuoka
  • Year and Date: 2016-07-16
  • Int'l Joint Research
• [Presentation] Spin Valve Junctions Comprising Fe-Si Materials (2016)
  • Author(s): Tsuyoshi Yoshitake*, Kazutoshi Nakashima, Kazuki Kudo, Kazuya Ishibashi, Yuki Asai,Ken-ichiro Sakai, and Hiroyuki Deguchi
  • Organizer: Asia-Pacific Conference on Semiconducting Silicides and Related Materials Science and Technology Towards Sustainable Electronics ( APAC Silicide 2016)
  • Place of Presentation: Nishijin Plaza, Kyushu University, Fukuoka
  • Year and Date: 2016-07-16
  • Int'l Joint Research
• [Remarks] 吉武研究室の研究紹介
  • URL: http://yoshitake.private.coocan.jp/univ_lab/exper_research_frontpage.htm