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2012 Fiscal Year Annual Research Report

縦型スピン伝導素子の創製に向けたハーフメタル合金上への半導体結晶成長

Research Project

Project/Area Number 11J01889
Research InstitutionKyushu University

Principal Investigator

山田 晋也  九州大学, 大学院・システム情報科学府, 特別研究員(DC2)

Keywordsスピントロニクス / ゲルマニウム / 分子線エピタキシー / ハーフメタル
Research Abstract

本研究は、研究代表者らがこれまで開発してきた『分子線エピタキシー(MBE)法による半導体Ge上への高品質なハーフメタル薄膜作製技術』で得られた知見を基に、未だ実現例のないハーフメタル上への高品質Ge薄膜のエピタキシャル成長条件を開発する。本研究により、縦型スピントランジスタの基本構造となる、全単結晶『ハーフメタル/Ge/ハーフメタル』縦型構造の創製が可能となり、既に提案されている横型スピントランジスタでは技術的に困難な、『極短チャネル化』や『立体構造高集積化』を可能とする夢の超低消費電力デバイスの実現が期待される。
本年度は、前年度で決定したGe薄膜を結晶成長する基板温度の上限(≦300℃)を基に、Co_2FeSi最表面のSi面終端、及びCo_2FeSi上へのGeエピタキシャル成長を検討した。まず、MBE装置に搭載している反射高速電子回折を用いて試料表面の原子配列を実時間観測し、Co_2FeSiのSi面終端層形成条件の最適化に取り組んだ。その結果、Si面終端層が1~2原子層程度の際には、Co_2FeSi表面はSi面終端層形成前と同等の平坦性を有するものの、Si面終端層をそれより多く形成すると、表面平坦性が徐々に悪化していく様子が観察された。これは、Co_2FeSi表面をSi面で原子層終端したか、Co_2FeSi上に非晶質Si層を形成したかの違いによって生じていると考えられる。表面平坦性が保持される条件でCo_2FeSi表面をSi面で原子層終端し、その上にGeを成長(≦300℃)させたところ、Co_2FeSi上にGe薄膜が単結晶成長した。因みに、表面平坦性が悪いCo_2FeSi上には、結晶欠陥を多く含むGe薄膜が形成された。Co_2FeSi最表面を原子層オーダーで制御してSi面で終端する技術が、その上にGe薄膜を単結晶成長させる上で極めて重要であることを明らかにした。

  • Research Products

    (42 results)

All 2013 2012

All Journal Article (14 results) (of which Peer Reviewed: 14 results) Presentation (28 results)

  • [Journal Article] An ultra-thin buffer layer for Ge epitaxial layers on Si2013

    • Author(s)
      M. Kawano, S. Yamada. K. Tanikawa, K. Sawano, M. Miyao, and K. Hamaya
    • Journal Title

      Applied Physics Letters

      Volume: 102 Pages: 121908-1-121908-3

    • DOI

      10.1063/1.4798659

    • Peer Reviewed
  • [Journal Article] ynamical Spin Injection into p-type Germanium at Room Temperature2013

    • Author(s)
      M. Koike, E. Shikoh, Y. Ando, T. Shinjo, S. Yamada. K. Hamaya and M. Shiraishi
    • Journal Title

      Applied Physics Express

      Volume: 6 Pages: 023001-1-023001-3

    • DOI

      10.7567/APEX.6.023001

    • Peer Reviewed
  • [Journal Article] Room-temperature sign reversed spin-accumulation signals in Si using an atomically smooth Fe_3Si/Si(111) interface2013

    • Author(s)
      Y. Fujita, S. Yamada. Y. Ando, K. Sawano, H. Itoh, M. Miyao, and K. Hamaya
    • Journal Title

      Journal of Applied Physics

      Volume: 113 Pages: 013916-1-013916-5

    • DOI

      10.1063/1.4773072

    • Peer Reviewed
  • [Journal Article] Room-temperature detection of spin accumulation in silicon across Schottky tunnel barriers using a MOSFET structure (invited)2013

    • Author(s)
      K. Hamaya, Y. Ando, K. Masaki, Y. Maeda. Y.・ Fujita. S. Yamada. K, Sawano, and M. Miyao
    • Journal Title

      Journal of Applied Physics

      Volume: 113 Pages: 17C501-1-17C501-6

    • DOI

      10.1063/1.4793501

    • Peer Reviewed
  • [Journal Article] Room-temperature Tunneling Magnetoresistance in Magnetic Tunnel Junctions with a DO_3-Fe_3Si Electrode2013

    • Author(s)
      Y. Fujita, S. Yamada. G Takemoto, S. Oki, Y. Maeda, M. Miyao, and K. Hamaya
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 52 Pages: 04CM02-1-04CM02-3

    • DOI

      10.7567/JJAP.52.04CM02

    • Peer Reviewed
  • [Journal Article] Molecular Beam Epitaxy of Co_2MnSi Films on Group-IV Semiconductors2013

    • Author(s)
      M. Kawano, S. Yamada. K. Tanikawa, S. Oki, M. Miyao, and K. Hamaya
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 52 Pages: 04CM06-1-04CM06-4

    • DOI

      10.7567/JJAP.52.04CM06

    • Peer Reviewed
  • [Journal Article] Atomically Controlled Epitaxial Growth of Single-ciystalline Germanium Films on a Metallic Silicide2012

    • Author(s)
      S. Yamada. K. Tanikawa, M. Miyao, and K. Hamaya
    • Journal Title

      Crystal Growth & Design

      Volume: 12 Pages: 4703-4707

    • DOI

      10.1021/cg300791w

    • Peer Reviewed
  • [Journal Article] Effect of the magnetic domain structure in the ferromagnetic contact on spin accumulation in silicon2012

    • Author(s)
      Y. Ando, S. Yamada. K. Kasahara, K. Sawano, M. Miyao, and K. Hamaya
    • Journal Title

      Applied Physics Letters

      Volume: 101 Pages: 232404-1-232404-4

    • DOI

      10.1063/1.4769221

    • Peer Reviewed
  • [Journal Article] Room-temperature structural ordering of a Heusler compound Fe_3Si2012

    • Author(s)
      S. Yamada,J. Sagar, S. Honda, L. Lari, G Takemoto, H. Itoh, A. Hirohata, K. Mibu, M. Miyao, and K. Hamaya
    • Journal Title

      Physical Review B

      Volume: 86 Pages: 144406-1-144406-7

    • DOI

      10.1103/PhysRevB.86.174406

    • Peer Reviewed
  • [Journal Article] Sign determination of spin polarization in L2_1-ordered Co_2FeSi using a Pt-based spin Hall device2012

    • 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 Pages: 144412-1-144412-4

    • DOI

      10.1103/PhysRevB.86.174412

    • Peer Reviewed
  • [Journal Article] Effect of Addition of A1 to Single-Crystalline CoFe Electrodes on Nonlocal Spin Signals in Lateral Spin-Valve Devices2012

    • Author(s)
      S. Oki, S. Yamada. N. Hashimoto, M. Miyao, T. Kimura, and K. Hamaya
    • Journal Title

      Applied Physics Express

      Volume: 5 Pages: 063004-1-063004-3

    • DOI

      10.1143/APEX.5.063004

    • Peer Reviewed
  • [Journal Article] SiGe Spintronics with Single-Crystalline Ferromagnetic Schottky-Tunnel Contacts2012

    • Author(s)
      K. Hamaya, S. Yamada. G Takemoto, K. Masaki, Y. Fujita, K. Kasahara, Y・ Ando, K. Sawano, and M. Miyao
    • Journal Title

      ECS Transactions

      Volume: 50 Pages: 235-243

    • DOI

      10.1149/05010.0235ecst

    • Peer Reviewed
  • [Journal Article] Effect of an Atomically Matched Structure on Fermi-level Pinning at Metal/p-Ge Interfaces2012

    • Author(s)
      K. Kasahara, H. Yoshioka, S. Yamada. T. Nishimura, M. Miyao, and K. Hamaya
    • Journal Title

      ECS Transactions

      Volume: 50 Pages: 223-229

    • DOI

      10.1149/05009.0223ecst

    • Peer Reviewed
  • [Journal Article] Generation and Detection of a Pure Spin Current using Co-Based Heusler-Alloy Spin Injector and Detector: Comparison ofCo_2MnSi and Co_2FeSi2012

    • Author(s)
      S. Oki, M.Kawano, K. Tanikawa, H. Aoki, S. Yamada. M. Miyao, and K. Hamaya
    • Journal Title

      ECS Transactions

      Volume: 50 Pages: 245-251

    • DOI

      10.1149/05009.0245ecst

    • Peer Reviewed
  • [Presentation] p型Geへの室温スピン注入と逆スピンホール効果の観測2013

    • Author(s)
      小池真利子,仕幸英治,安藤裕一郎,新庄輝也,山田晋也,浜屋宏平,白石誠司
    • Organizer
      第60回春季応用物理学会学術講演会
    • Place of Presentation
      神奈川
    • Year and Date
      2013-03-28
  • [Presentation] Pd/Fe_3Si試料を用いたスピンポンピングにおける巨大信号の検出2013

    • Author(s)
      市場昂基,安藤裕一郎,仕幸英治,山田晋也,浜屋宏平,新庄輝也,白石誠司
    • Organizer
      第60回春季応用物理学会学術講演会
    • Place of Presentation
      神奈川
    • Year and Date
      2013-03-28
  • [Presentation] HEPESによるFe_3Si/Geヘテロ構造の評価2013

    • Author(s)
      松本宏哉,山田晋也,笠原健司,浜屋宏平,津野憲太郎,宮尾正信,野平博司
    • Organizer
      第60回春季応用物理学会学術講演会
    • Place of Presentation
      神奈川
    • Year and Date
      2013-03-28
  • [Presentation] HEPESによるFe_3Si/Geヘテロ構造の評価2013

    • Author(s)
      松本宏哉,山田晋也,笠原健司,浜屋宏平,津野憲太郎,宮尾正信,野平博司
    • Organizer
      ゲートスタツク研究会一材料・プロセス・評価の物理-(第18回)
    • Place of Presentation
      広島
    • Year and Date
      2013-01-25
  • [Presentation] Control of room-temperature spin polarization in Heusler-compound Fe_<3-x>Co_xSi lms grown on Si by substitution of Co for Fe2013

    • 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.
    • Year and Date
      2013-01-16
  • [Presentation] Room-temperature detection of negative spin accumulation in Si across an atomically smooth Fe_3Si/Si(111) heterointerface2013

    • Author(s)
      Y.Fujita, S. Yamada. K. Sawano, H. Itoh, M. Miyao, and K. Hamaya
    • Organizer
      The 12th Joint MMM/Intermag Conference
    • Place of Presentation
      Chicago, U.S.A
    • Year and Date
      2013-01-15
  • [Presentation] 強磁性金属上への単結晶Ge薄膜の高品質成長2012

    • Author(s)
      河野慎,山田晋也,谷川昂平,宮尾正信,浜屋宏平
    • Organizer
      第42回結晶成長国内会議
    • Place of Presentation
      福岡
    • Year and Date
      2012-11-11
  • [Presentation] IV族半導体EにおけるCo系ホイスラー合金薄膜の室温エピタキシャル成長2012

    • Author(s)
      谷川昂平,山田晋也,沖宗一郎,河野慎,宮尾正信,浜屋宏平
    • Organizer
      第42回結晶成長国内会議
    • Place of Presentation
      福岡
    • Year and Date
      2012-11-11
  • [Presentation] SiGe Spintronics with Single-Crystalline Ferromagnetic Schottky-Tunnel Contacts2012

    • Author(s)
      K. Hamaya, S. Yamada. and M. Miyao
    • Organizer
      PRiME 2012
    • Place of Presentation
      Hawaii, U.S.A.(招待講演)
    • Year and Date
      2012-10-10
  • [Presentation] Generation and detection of a pure spin current using Co-based Heusler-alloy spin injector and detector: Comparison of Co_2FeSi and Co_2MnSi2012

    • Author(s)
      S. Oki, M. Kawano, K. Tanikawa, H. Aoki, S. Yamada. M. Miyao, and K. Hamaya
    • Organizer
      PRiME 2012
    • Place of Presentation
      Hawaii, U.S.A.
    • Year and Date
      2012-10-10
  • [Presentation] Effect of an Atomically Matched Structure on Fermi-level Pinning at Metal/p-Ge Interfaces2012

    • Author(s)
      K. Kasahara, H. Yoshioka, S. Yamada. T. Nishimura, M. Miyao, and K. Hamaya
    • Organizer
      PRiME 2012
    • Place of Presentation
      Hawaii, U.S.A.
    • Year and Date
      2012-10-10
  • [Presentation] Suppression of Fermi-level pinning at bcc-metal/Ge( 111) interfaces2012

    • Author(s)
      H. Yoshioka, K. Kasahara, T. Nishimura, S. Yamada. M. Miyao and K. Hamaya
    • Organizer
      IUMRS-International Conference on Electronic Materials(IUMRS-ICEM 2012)
    • Place of Presentation
      Yokohama
    • Year and Date
      2012-09-28
  • [Presentation] Room-Temperature Detection of Spin-Accumulation Signals in a Silicon-Based MOSFET Structure with a Schottky-Tunnel Contact2012

    • Author(s)
      K. Hamaya, K. Masaki, Y Fujita, S. Yamada. K. Sawano, and M. Miyao
    • Organizer
      International Conference on Solid State Devices and Materials 2012 (SSDM 2012)
    • Place of Presentation
      Kyoto
    • Year and Date
      2012-09-27
  • [Presentation] Atomically controlled heteroepitaxy of a single-crystalline germanium film on a metallic silicide2012

    • Author(s)
      S. Yamada. M. Kawano, K. Tanikawa, M. Miyao, and K. Hamaya
    • Organizer
      International Conference on Solid State Devices and Materials 2012 (SSDM 2012)
    • Place of Presentation
      Kyoto
    • Year and Date
      2012-09-26
  • [Presentation] Molecular Beam Epitaxy Growth of Co_2MnSi Films on Group-IV Semiconductors2012

    • Author(s)
      M. Kawano, S. Yamada. S. Oki, K. Tanikawa, M. Miyao, and K. Hamaya
    • Organizer
      International Conference on Solid State Devices and Materials 2012 (SSDM 2012)
    • Place of Presentation
      Kyoto
    • Year and Date
      2012-09-26
  • [Presentation] Room-temperature spin polarization of epitaxial Fe_3Si films with D0_3-ordered structures estimated by tunneling magnetoresistance measurements2012

    • Author(s)
      Y, Fujita, S. Yamada. Y. Maeda, S. Oki, M. Miyao, and K. Hamaya
    • Organizer
      International Conference on Solid State Devices and Materials 2012 (SSDM 2012)
    • Place of Presentation
      Kyoto
    • Year and Date
      2012-09-26
  • [Presentation] Low-temperature growth of Co-based Heusler-alloy films on group-IV semiconductors by molecular beam epitaxy2012

    • Author(s)
      M. Kawano, S. Yamada. S. Oki, K. Tanikawa, M. Miyao, and K. Hamaya
    • Organizer
      IUMRS-International Conference on Electronic Materials(IUMRS-ICEM 2012)
    • Place of Presentation
      Yokohama
    • Year and Date
      2012-09-24
  • [Presentation] Estimation of room-temperature spin polarization of epitaxial Fe_3Si films with D0_3-ordered structures2012

    • Author(s)
      Y. Fujita. S. Yamada. Y. Maeda, S. Oki, M. Miyao, and K. Hamaya
    • Organizer
      IUMRS-International Conference on Electronic Materials(IUMRS-ICEM 2012)
    • Place of Presentation
      Yokohama
    • Year and Date
      2012-09-24
  • [Presentation] 原子層制御分子線エピタキシーによる金属上への単結晶qe薄膜の成長2012

    • Author(s)
      山田晉也,谷川昂平,宮尾正信,浜屋宏平
    • Organizer
      第73回秋季応用物理学会学術講演会
    • Place of Presentation
      松山
    • Year and Date
      2012-09-13
  • [Presentation] Low-temperature epitaxial growth of Co-based Heusler alloys on group-IV semiconductors2012

    • 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(PASPS VII)
    • Place of Presentation
      Eindhoven, Netherlands
    • Year and Date
      2012-08-08
  • [Presentation] Room temperature detection of spin accumulation created in n-Ge through Schottky tunnel contacts2012

    • Author(s)
      G Takemoto, Y. Baba, Y. Fujita, S. Yamada. K. Kasahara, Y. Hoshi, K.Sawano, M. Miyao, and K. Hamaya
    • Organizer
      The 7th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors(PASPS VII)
    • Place of Presentation
      Eindhoven, Netherlands
    • Year and Date
      2012-08-06
  • [Presentation] Dependence of Schottky barrier height on the junction size of bcc-metal/n-Ge(l 11)contacts2012

    • Author(s)
      H. Yoshioka, K. Kasahara, T. Nishimura, S. Yamada. M. Miyao and K. Hamaya
    • Organizer
      2012 Asia-Pacific Workshop on Fundamentals and Applications of Advanced Semiconductor Device
    • Place of Presentation
      Okinawa
    • Year and Date
      2012-06-28
  • [Presentation] Composition dependence of the Gilbert damping constant for Co-based Heusler alloy2012

    • Author(s)
      Y. Kasatani, S. Yamada. M. Miyao, K. Hamaya, H. Itoh and Y. Nozaki
    • Organizer
      International Conference on Magnetism 2012 (ICM 2012)
    • Place of Presentation
      Busan, Korea
    • Year and Date
      2012-06-12
  • [Presentation] Pure spin current generation using highly spin polarized Co_2FeSi electrodes2012

    • Author(s)
      T. Kimura, S. Oki, S. Yamada. M. Miyao and K. Hamaya
    • Organizer
      International Conference on Magnetism 2012 (ICM 2012)
    • Place of Presentation
      Busan. Korea
    • Year and Date
      2012-06-12
  • [Presentation] Room-temperature spin injection into Si in a metal-oxide-semiconductor field effect transistor structure with a high-quality Schottky-tunnel contact2012

    • Author(s)
      Y. Ando, K. Masaki, K. Kasahara, S. Yamada. Y. Hoshi, K. Sawano, M. Miyao, K. Hamaya
    • Organizer
      2012 MRS Spring Meeting & Exhibit
    • Place of Presentation
      San Francisco, U.S.A.
    • Year and Date
      2012-04-10
  • [Presentation] Marked suppression of the Fermi-level pinning at metal/Ge(lll) junctions with atomically matched interfaces2012

    • Author(s)
      K. Kasahara, S. Yamada. M. Miyao, and K. Hamaya
    • Organizer
      2012 MRS Spring Meeting & Exhibit
    • Place of Presentation
      San Francisco, U.S.A.
    • Year and Date
      2012-04-10
  • [Presentation] Giant spin accumulation at room temperature in Co_2FeSi/Cu lateral spin valves2012

    • Author(s)
      S. Oki, N. Hashimoto, S. Yamada. T. Kimura, M. Miyao, and K. Hamaya
    • Organizer
      International Magnetics Conference 2012 (INTERMAG2012)
    • Place of Presentation
      Vancouver, Canada
    • Year and Date
      2012-03-10
  • [Presentation] Spin accumulation in M-Ge detected by three-terminal Hanle-effect measurements through Fe_3Si/η+-Ge contacts2012

    • Author(s)
      S. Yamada. Y. Baba, G Takemoto, K. Kasahara, Y. Hoshi, K. Sawano, M. Miyao, and K. Hamaya
    • Organizer
      International Magnetics Conference 2012 (INTERMAG2012)
    • Place of Presentation
      Vancouver, Canada
    • Year and Date
      2012-03-09

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Published: 2014-07-16  

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