Control of spin polarization of ferromagnetic alloys in a microscopic area in a Si platform

• Project/Area Number: 23656223
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Kyushu University
• Principal Investigator: HAMAYA Kohei 九州大学, 大学院・システム情報科学研究院, 准教授 (90401281)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 電気 / 電子材料 / スピントロニクス / エピタキシャル成長 / ホイスラー合金 / 分子線エピタキシー

Research Abstract

We demonstrated high-quality L21-Co2FeSi (CFS)/D03-Fe3Si (FS) bilayer structure by using molecular beam epitaxy (MBE). This bilayer was fabricated into lateral spin-valve devices (LSVs) with L21-Co2FeSi (CFS) and D03-Fe3Si (FS) electrodes. Even in a microscopic area in asame Si platform, we can obtain two different spin injectors consisting of single-crystalline Heusler compounds with the different spin functionalities. This work will open a way for intentional arrangement of various spin injectors for spintronic applications in the same Si platform.

Research Products

• [Journal Article] Sign determination of spin polarization in L2_1-ordered Co_2FeSi using a Pt-based spin Hall device (2012)
  • Author(s): S. Oki, K. Masaki, N. Hashimoto, S Yamada. M. Miyata, M. Miyao, T. Kimura, and K. Hamaya
  • Journal Title: Physical Review B Volume: 86 Issue: 17
  • DOI: 10.1103/physrevb.86.174412
  • Peer Reviewed
• [Journal Article] Generation and detection of a pure spin current using Co-based Heusler-alloy spin injector and detector: Comparison of Co2MnSi and Co2FeSi (2012)
  • Author(s): S. Oki, M. Kawano, K. Tanikawa, H. Aoki, S. Yamada, M. Miyao, and K. Hamaya
  • Journal Title: ECS Transaction Volume: 50 (10) Pages: 245-251
  • Peer Reviewed
• [Journal Article] Effect of Addition of A1 to Single-Crystalline CoFe Electrodes on Nonlocal Spin Signals in Lateral Spin-Valve Devices (2012)
  • Author(s): S. Oki, S. Yamada. N. Hashimoto, M. Miyao, T. Kimura, and K. Hamaya
  • Journal Title: Applied Physics Express Volume: 5 Issue: 6 Pages: 063004-063004
  • DOI: 10.1143/apex.5.063004
  • Peer Reviewed
• [Journal Article] Estimation of the spin polarization for Heusler-compound thin films by means of nonlocal spin-valve measurements : Comparison of Co_2FeSi and Fe_3Si (2012)
  • Author(s): K.Hamaya, N.Hashimoto, S.Oki, S.Yamada, M.Miyao, T.Kimura
  • Journal Title: Phys.Rev.B (Rapid Communication) Volume: 85 Issue: 10 Pages: 100404-100404
  • DOI: 10.1103/physrevb.85.100404
  • Peer Reviewed
• [Presentation] 低温形成ホイスラー合金を用いた純スピン流の生成・検出 (2013)
  • Author(s): 浜屋宏平
  • Organizer: 第60回応用物理学会春季学術講演会
  • Place of Presentation: 神奈川工科大学
  • Year and Date: 2013-03-19
• [Presentation] Control of room-temperature spin polarization in Heusler-compound Fe3-xCoxSi films grown on Si by substitution of Co for Fe (2013)
  • Author(s): K. Tanikawa, S. Oki, S. Yamada, K. Mibu, M. Miyao, and K. Hamaya
  • Organizer: The 12th Joint MMM/Intermag Conference
  • Place of Presentation: Chicago, U.S.A
• [Presentation] 低温形成ホイスラー合金を用いた純スピン流の生成・検出 (2013)
  • Author(s): 浜屋宏平
  • Organizer: 第60回応用物理学会春季学術講演会
  • Place of Presentation: 神奈川
  • Invited
• [Presentation] Generation and detection of a pure spin current using Co-based Heusler-alloy spin injector and detector: Comparison of Co2FeSi and Co2MnSi (2012)
  • Author(s): S. Oki, M. Kawano, K. Tanikawa, H. Aoki, S. Yamada, M. Miyao, and K. Hamaya
  • Organizer: PRiME 2012, ECS Pacific RIM Meeting
  • Place of Presentation: Hawaii, U.S.A
  • Year and Date: 2012-10-10
• [Presentation] Low-temperature epitaxial growth of Co-based Heusler alloys on group-IV semiconductors (2012)
  • Author(s): S. Oki, S. Yamada, K. Tanikawa, M. Miyao, and K. Hamaya
  • Organizer: The 7th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors
  • Place of Presentation: Netherlands.
  • Year and Date: 2012-08-07
• [Presentation] Giant spin accumulation at room temperature in Co2FeSi/Cu lateral spin valves (2012)
  • Author(s): S. Oki, N. Hashimoto, S. Yamada, T. Kimura, M. Miyao and K. Hamaya
  • Organizer: Intermag2012, FU-01
  • Place of Presentation: Vancouver,Canada.
• [Presentation] Generation and detection of a pure spin current using Co-based Heusler-alloy spin injector and detector: Comparison of Co2FeSi and Co2MnSi (2012)
  • Author(s): S. Oki, M. Kawano, K. Tanikawa, H. Aoki, S. Yamada, M. Miyao, and K. Hamaya
  • Organizer: PRiME 2012, ECS Pacific RIM Meeting 2012
  • Place of Presentation: Hawaii, U.S.A.
• [Presentation] ホイスラー合金電極を用いた純スピン流の生成と検出 (2012)
  • Author(s): S. Oki et al.
  • Organizer: IV族スピントロニクスに関する国際WS
  • Place of Presentation: Osaka, Japan
• [Presentation] 単結晶ホイスラー合金横型スピン素子におけるスピン伝導 (2011)
  • Author(s): N. Hashimoto et al.
  • Organizer: MMM conference
  • Place of Presentation: Arizona, U.S.A
• [Remarks]
  • URL: http://nano.ed.kyushu-u.ac.jp/~hamaya_lab/index.html