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2008 Fiscal Year Final Research Report

Heusler alloy - Carbon nanotube junctions as a probe for detectinglocal spin states

Research Project

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Project/Area Number 19760225
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Electron device/Electronic equipment
Research InstitutionHokkaido University

Principal Investigator

MATSUDA Kenichi  Hokkaido University, 大学院情報科学研究科, 助教授 (80360931)

Project Period (FY) 2007 – 2008
Keywordsスピントロニクス / ハーフメタル強磁性体 / ホイスラー合金 / カーボンナノチューブ
Research Abstract

本研究の成果は、電極として採用したハーフメタル系強磁性材料Co2MnSi、Co2MnGe、Co2Cr0.6Fe0.4Al のエピタキシャル成長に成功したこと、またその高いスピン偏極率を、強磁性トンネル接合の電気伝導特性を通して明らかにしたことである。電子スピン検出を行うには、高い偏極率を有する強磁性材料を単結晶成長することが重要であり、本研究においてCo 系ホイスラー合金の潜在的な能力の高さを示すことができた。

  • Research Products

    (47 results)

All 2009 2008 2007

All Journal Article (17 results) (of which Peer Reviewed: 16 results) Presentation (29 results) Book (1 results)

  • [Journal Article] Tunneling anisotropic magnetoresistance in epitaxial CoFe/n-GaAs junctions2009

    • Author(s)
      T. Uemuara, Y. Imai, M. Harada, K.-I. Matsuda, and M. Yamamoto
    • Journal Title

      Appl. Phys. Lett. vol. 94

      Pages: 182502-1-182502-3

    • Peer Reviewed
  • [Journal Article] Transport properties of Nb/PdNi bilayers and Nb/PdNi/Nb Josephson junctions2009

    • Author(s)
      K.-I. Matsuda, Y. Akimoto, T. Uemura and M. Yamamoto
    • Journal Title

      J. Physics: Conference Series vol. 150

      Pages: 0521551-1-0521551-4

    • Peer Reviewed
  • [Journal Article] Spin-dependent tunneling characteristics of fully epitaxial magnetic tunnel junctions with a Heusler alloy Co2MnGe thin film and a MgO barrier2009

    • Author(s)
      T. Taira, T. Ishikawa, N. Itabashi, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      J. Phys. D: Applied Phys. vol. 42

      Pages: 084015-1-084015-9

    • Peer Reviewed
  • [Journal Article] Half-metallic electronic structure of Co_2MnSi electrodes in fully epitaxial Co_2MnSi/MgO/Co_2MnSi magnetic tunnel junctions proved by tunneling spectroscopy2009

    • Author(s)
      T. Ishikawa, N. Itabashi, T. Taira, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      J. Appl. Phys. vol. 105

      Pages: 07B110-1-07B110-6

    • Peer Reviewed
  • [Journal Article] Critical role of interface states for spin-dependent tunneling in half-metallic Co_2MnSi-based magnetic tunnel junctions investigated by tunneling spectroscopy2009

    • Author(s)
      T. Ishikawa, N. Itabashi, T. Taira, K.-. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      Appl. Phys. Lett. vol. 94

      Pages: 092503-1-092503-3

    • Peer Reviewed
  • [Journal Article] Influence of annealing on spin-dependent tunneling characteristics of fully epitaxial Co_2MnGe / MgO /Co_<50>Fe_<50> magnetic tunnel junctions2009

    • Author(s)
      T. Taira, T. Ishikawa, N. Itabashi, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      Appl. Phys. Lett. vol.94

      Pages: 072510-1-072510-3

    • Peer Reviewed
  • [Journal Article] Fabrication and Characterization of Fully Epitaxial Magnetic Tunnel Junction Field Sensors using a Co2MnSi Thin Film2008

    • Author(s)
      M. Masuda, T. Uemura, K.-I. Matsuda and M. Yamamoto
    • Journal Title

      IEEE Transactions on Magnetics vol.44

      Pages: 3996-399

    • Peer Reviewed
  • [Journal Article] Epitaxial growth and characterization of Co_2MnSi thin films on GaAs with MgO interlayer2008

    • Author(s)
      T. Uemura, Y. Imai, S. Kawagishi, K.-I. Matsuda, and M. Yamamoto
    • Journal Title

      Physica E: Low-dimensional Systems and Nanostructures vol. 40

    • Peer Reviewed
  • [Journal Article] Fabrication of fully epitaxial Co_2MnSi/MgO/Co_2MnSi magnetic tunnel junctions2008

    • Author(s)
      T. Ishikawa, S. Hakamata, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      J. Appl. Phys. vol. 103

      Pages: 07A919-1-07A919-3

    • Peer Reviewed
  • [Journal Article] Magnetic and transport properties of superconductor / ferromagnetic bilayer microbridges2008

    • Author(s)
      K.-I. Matsuda, Y. Akimoto, T. Uemura, and M. Yamamoto
    • Journal Title

      J. Appl. Phys. (and selected for the February 15, 2008 issue of Virtual Journal of Applications of Superconductivity) vol. 103

      Pages: 07C711-1-07C711-3

  • [Journal Article] Structural, magnetic and electrical properties of Co_2MnSi / MgO / n-GaAs tunnel junction2008

    • Author(s)
      S. Kawagishi, T. Uemura, Y. Imai, K.-I. Matsuda, and M. Yamamoto
    • Journal Title

      J. Appl. Phys. vol.103

      Pages: 07A703-1-07A703-3

    • Peer Reviewed
  • [Journal Article] Structural and magnetic properties of Co_2Cr_<0.6>Fe_<0.4>Al thin films epitaxially grown on GaAs substrate with MgO interlayer2007

    • Author(s)
      T. Uemura, T. Yano, K.-I. Matsuda, and M. Yamamoto
    • Journal Title

      Thin Solid Films vol. 515

      Pages: 8013-8016

    • Peer Reviewed
  • [Journal Article] Fabrication of Epitaxial Magnetic Tunnel Junctions with a Co_2Cr_<0.>6Fe_<0.4>Al Thin Film and Their Tunnel Magnetoresistance Characteristics2007

    • Author(s)
      T. Marukame, T. Ishikawa, S. Hakamata, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      J. Magn. Soc. Jpn. vol. 31

      Pages: 344-350

    • Peer Reviewed
  • [Journal Article] Fabrication of Fully Epitaxial Co_2Cr_<0.6>Fe_<0.4>Al / MgO / Co_2Cr_<0.6>Fe_<0.4>Al Magnetic Tunnel Junctions2007

    • Author(s)
      T. Marukame, T. Ishikawa, S. Hakamata, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Journal Title

      IEEE Trans. On Magn. vol.43

      Pages: 2782-2784

    • Peer Reviewed
  • [Journal Article] Magnetic and Transport Properties of Nb/PdNi Bilayers2007

    • Author(s)
      K.-I. Matsuda, H. Niwa, Y. Akimoto, T. Uemura, and M. Yamamoto
    • Journal Title

      IEEE Trans. On Appl. Supercond. vol. 17

      Pages: 3529-3532

    • Peer Reviewed
  • [Journal Article] Four-state Magnetoresistance in Epitaxial CoFe-based Magnetic Tunnel Junction2007

    • Author(s)
      T. Uemura, T. Marukame, K.-I. Matsuda, and M.Yamamoto
    • Journal Title

      IEEE Trans. On Magn. vol. 43

      Pages: 2791-2793

    • Peer Reviewed
  • [Journal Article] Improved tunnel magnetoresistance characteristics of magnetic tunnel junctions with a Heusler alloy thin film of Co2MnGe and a MgO tunnel barrier2007

    • Author(s)
      S. Hakamata, T. Ishikawa, T. Marukame, K.-I. Matsuda, T. Uemura, M. Arita, and M. Yamamoto
    • Journal Title

      J. Appl. Phys. vol. 101

      Pages: 09J513-1-09J513-3

    • Peer Reviewed
  • [Presentation] エピタキシャルCoFe/n-GaAs 接合における磁気抵抗特性2009

    • Author(s)
      今井洋介,原田雅亘,植村哲也,松田健一, 山本眞史
    • Organizer
      2009 年 (平成21 年) 春季第56 回応用物理学会関係連合講演会
    • Place of Presentation
      31a-L-7,つくば市,筑波大学
    • Year and Date
      20090330-0402
  • [Presentation] 強磁性細線中を伝搬する磁壁の構造および運動のTMR 検出のシミュレーション2009

    • Author(s)
      澤田圭佑,植村哲也,増田昌洋,松田健一,山本眞史
    • Organizer
      2009 年 (平成21 年)春季第56 回応用物理学会関係連合講演会
    • Place of Presentation
      31a-L-7,つくば市、筑波大学
    • Year and Date
      20090330-0402
  • [Presentation] エピタキシャルCoFe/n-GaAs 接合における磁気抵抗特性2009

    • Author(s)
      今井洋介,原田雅亘,植村哲也,松田健一, 山本眞史
    • Organizer
      The 13th Symposiumu on the Physics and Application of Spin-Related Phenomena in Semiconductors (PASPS13)
    • Place of Presentation
      仙台市,東北大学
    • Year and Date
      20090127-28
  • [Presentation] Co_2Cr_<0.6>Fe_<0.4>Al / MgO / Co_<50>Fe_<50> 強磁性トンネル接合のコンダクタンス特性に対するアニールの影響2009

    • Author(s)
      米村和希,板橋直樹,松田健一,植村哲也,山本眞史
    • Organizer
      2009 年 (平成21 年) 第44 回応用物理学会北海道支部学術講演会 講演予稿集B-16
    • Place of Presentation
      函館市,サン・リフレ函館
    • Year and Date
      20090108-09
  • [Presentation] Co_2Cr_<0.6>Fe_<0.4>Al/MgO/Co_2Cr_<0.6>Fe_<0.4>Al 強磁性トンネル接合のスピン依存コンダクタンス特性2009

    • Author(s)
      板橋直樹,石川貴之,米村和希,松田健一, 植村哲也, 山本眞史
    • Organizer
      2009 年 (平成21 年) 第44 回応用物理学会北海道支部学術講演会 講演予稿集 B-17
    • Place of Presentation
      函館市,サン・リフレ函館
    • Year and Date
      20090108-09
  • [Presentation] ホイスラー合金薄膜を上部フリー層に用いた微細MTJ の作製と評価2009

    • Author(s)
      増田昌洋,澤田圭佑,植村哲也,松田健一,山本眞史
    • Organizer
      2009 年 (平成21 年) 第44 回応用物理学会北海道支部学術講演会 B-21
    • Place of Presentation
      函館市,サン・リフレ函館
    • Year and Date
      20090108-09
  • [Presentation] CoFe/n-GaAs/CoFe 横型接合における磁気抵抗特性2009

    • Author(s)
      今井洋介,原田雅亘,植村哲也,松田健一,山本眞史
    • Organizer
      2009 年(平成21 年) 第44 回応用物理学会北海道支部学術講演会 B-22
    • Place of Presentation
      函館市,サン・リフレ函館
    • Year and Date
      20090108-09
  • [Presentation] Co_2MnSi 細線電極における磁壁構造に依存したトンネル磁気抵抗のシミュレーション2009

    • Author(s)
      澤田圭佑,増田昌洋,植村哲也,松田健一,山本眞史
    • Organizer
      2009 年 (平成21 年) 第44 回応用物理学会北海道支部学術講演会 B-23
    • Place of Presentation
      函館市,サン・リフレ函館
    • Year and Date
      20090108-09
  • [Presentation] ハーフメタル系強磁性体(Co_2Cr_<0.6>Fe_<0.4>Al)/超伝導体(NbN)二層薄膜のエピタキシャル成長2009

    • Author(s)
      井悟嗣,石川貴之,松田健一,植村哲也,山本眞史
    • Organizer
      2009 年(平成21 年) 第44 回応用物理学会北海道支部学術講演会 講演予稿集 B-24
    • Place of Presentation
      函館市,サン・リフレ函館
    • Year and Date
      20090108-09
  • [Presentation] Tunneling spectroscopy of fully epitaxial CO_2MnSi/MgO/CO_2MnSi magnetic tunnel junctions2008

    • Author(s)
      T. Ishikawa, N. Itabashi, T. Taira, K.-I. Matsuda, T. Uemura and M. Yamamoto
    • Organizer
      2008 Material Research Society (MRS) Fall Meeting, L5.1
    • Place of Presentation
      Boston, MA, USA
    • Year and Date
      20081201-05
  • [Presentation] Tunneling conductance characteristics for Co_2Cr_<0.6>Fe_<0.4>Al /MgO / Co_2Cr_<0.6>Fe_<0.4>Al magnetic tunnel junctions2008

    • Author(s)
      N. Itabashi, T. Ishikawa, K. Yonemura, K.-I. Matsuda, T. Uemura and M. Yamamoto
    • Organizer
      2008 Material Research Society (MRS) Fall Meeting, L2.10
    • Place of Presentation
      Boston, MA, USA
    • Year and Date
      20081201-05
  • [Presentation] Spin-polarized tunneling in fully epitaxial magnetic tunnel junctions with Heusler alloy thin films and a MgO barrier2008

    • Author(s)
      M. Yamamoto, T. Ishikawa, K.-I. Matsuda, and T. Uemura
    • Organizer
      2008 Material Research Society (MRS) Fall Meeting, L2.6
    • Place of Presentation
      Boston, MA, USA
    • Year and Date
      20081201-05
  • [Presentation] Tunnel magnetoresistance characteristics of post-deposition-annealed CO_2MnGe / MgO / CoFe tunnel junctions2008

    • Author(s)
      T. Taira, T. Ishikawa, K.-I. Matsuda,T. Uemura and M. Yamamoto
    • Organizer
      2008 Material Research Society (MRS) Fall Meeting, Boston, L2.1
    • Place of Presentation
      Boston, MA, USA
    • Year and Date
      20081201-05
  • [Presentation] Spin-dependent electronic structures of Co_2Cr_<0.6>Fe_<0.4>Al electrodes investigated through tunneling spectroscopy2008

    • Author(s)
      N. Itabashi, T. Ishikawa, K. Yonemura, K.-I. Matsuda, T. Uemura and M. Yamamoto
    • Organizer
      53rd Magnetism and Magnetic Materials Conference, GT-03
    • Place of Presentation
      Austin, TX, USA
    • Year and Date
      20081110-15
  • [Presentation] Tunneling spectroscopy of Co_2Cr_<0.6>Fe_<0.4>Al/MgO/CoFe magnetic tunnel junctions2008

    • Author(s)
      K. Yonemura, T. Ishikawa, N. Itabashi, K.-I. Matsuda, T. Uemura and M. Yamamoto
    • Organizer
      53rd Magnetism and Magnetic Materials Conference, ED-07
    • Place of Presentation
      Austin, TX, USA
    • Year and Date
      20081110-15
  • [Presentation] Spin-dependent tunneling characteristics of CO_2MnGe/MgO/CoFe tunnel junctions2008

    • Author(s)
      T. Taira, T. Ishikawa, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Organizer
      53rd Magnetism and Magnetic Materials Conference, DD-02
    • Place of Presentation
      Austin, TX, USA
    • Year and Date
      20081110-15
  • [Presentation] Half-metallic electronic structure of CO_2MnSi electrodes proved by tunneling spectroscopy2008

    • Author(s)
      T. Ishikawa, N. Itabashi, T. Taira, K.-I. Matsuda, T. Uemura and M. Yamamoto
    • Organizer
      53rd Magnetism and Magnetic Materials Conference, DD-07
    • Place of Presentation
      Austin, TX, USA
    • Year and Date
      20081110-15
  • [Presentation] Fabrication of fully epitaxial magnetic tunnel junctions with half-metallic Heusler alloy thin films and a MgO tunnel barrier2008

    • Author(s)
      M. Yamamoto, T. Uemura, and K.-I. Matusda
    • Organizer
      The 10th Int'l Joint Symposium between Hokkaido University and Chungnam National University
    • Place of Presentation
      Sapporo
    • Year and Date
      20081022-24
  • [Presentation] Spin-dependent tunneling spectroscopy of fully epitaxial magnetic tunnel junctions with Heusler alloy Co_2Cr_<0.6>Fe_<0.4>Al electrodes and a MgO barrier2008

    • Author(s)
      N. Itabashi, T. Ishikawa, K.-I. Matsuda, T. Uemura, and M. Yamamoto,
    • Organizer
      25th Int'l Conf. on Low Temp. Physics, PD-Mo244
    • Place of Presentation
      Amsterdam, The Netherlands
    • Year and Date
      20080806-13
  • [Presentation] Transport Properties of Nb/PdNi bilayers and Nb/PdNi/Nb Josephson junctions2008

    • Author(s)
      K.-I. Matsuda, Y. Akimoto, T. Uemura, and M. Yamamoto
    • Organizer
      25th Int'l Conf. on Low Temp. Physics, p. 25, PB-Th118
    • Place of Presentation
      Amsterdam, The Netherlands
    • Year and Date
      20080806-13
  • [Presentation] Spin-dependent tunneling conductance in fully epitaxial CO_2MnSi/MgO/CO_2MnsI tunnel junctions2008

    • Author(s)
      T. Ishikawa, N. Itabashi, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Organizer
      Technical Digests of IEEE Int'l Magnetics Conf. Europe 2008, AC-07
    • Place of Presentation
      Madrid, Spain
    • Year and Date
      20080504-08
  • [Presentation] Fabrication and characterization of magnetic tunnel junction field sensors with a CO_2MnSi thin film2008

    • Author(s)
      M. Masuda, T. Uemura, K.-I. Matsuda and M. Yamamoto
    • Organizer
      Technical Digests of IEEE Int'l Magnetics Conf. Europe 2008, BD-04
    • Place of Presentation
      Madrid, Spain
    • Year and Date
      20080504-08
  • [Presentation] Heusler alloy-based fully epitaxial magnetic tunnel junctions with a MgO barrier2008

    • Author(s)
      M. Yamamoto, T. Uemura, and K.-I. Matsuda
    • Organizer
      2008 RCIQE Int'l Seminar on "Advanced Semiconductor Materials and Devices"
    • Place of Presentation
      Sapporo, Japan
    • Year and Date
      20080303-04
  • [Presentation] Magnetic and transport properties of superconductor / ferromagnet bilayer microbridges2007

    • Author(s)
      K.-I. Matsuda, Y. Akimoto, T. Uemura, and M. Yamamoto
    • Organizer
      52nd Magnetism and Magnetic Materials Conference, HQ-10
    • Place of Presentation
      Tampa, Florida, USA
    • Year and Date
      20071105-09
  • [Presentation] Highly spin-polarized tunneling in Heusler alloy-based fully epitaxial magnetic tunnel junctions with a MgO tunnel barrier2007

    • Author(s)
      M. Yamamoto, T. Marukame, T. Ishikawa, K.-I. Matsuda, and T. Uemura
    • Organizer
      52nd Magnetism and Magnetic Materials Conference, DB-01
    • Place of Presentation
      Tampa, Florida, USA
    • Year and Date
      20071105-09
  • [Presentation] Oscillations in tunneling resistance as a function of MgO barrier thickness in fully epitaxial magnetic tunnel junctions of Co_2Cr_<0.6>Fe_<0.4>Al / MgO / Co_<50> Fe_<50>2007

    • Author(s)
      M. Yamamoto, T. Marukame, T. Ishikawa, K.-I. Matsuda, and T. Uemura
    • Organizer
      52nd Magnetism and Magnetic Materials Conference, AB-11
    • Place of Presentation
      Tampa, Florida, USA
    • Year and Date
      20071105-09
  • [Presentation] Spin-dependent tunneling in fully epitaxial CO_2MnSi / MgO / CO_2MnSi magnetic tunnel junctions2007

    • Author(s)
      T. Ishikawa, S. Hakamata, K.-I. Matsuda, T. Uemura, and M. Yamamoto
    • Organizer
      52nd Magnetism and Magnetic Materials Conference, AB-07
    • Place of Presentation
      Tampa, Florida, USA
    • Year and Date
      20071105-09
  • [Presentation] Electrical characterization of epitaxial CO_2MnSi / MgO / n-GaAs tunnel junctions2007

    • Author(s)
      S. Kawagishi, T. Uemura, Y. Imai, K.-I. Matsuda, and M. Yamamoto
    • Organizer
      52nd Magnetism and Magnetic Materials Conference, AG-09
    • Place of Presentation
      Tampa, Florida, USA
    • Year and Date
      20071105-09
  • [Presentation] Epitaxial growth and characterization of CO_2MnSi thin films on GaAs with MgO interlayer2007

    • Author(s)
      T. Uemura, T. Yano, Y. Imai, K.-I. Matsuda, and M. Yamamoto
    • Organizer
      The 13th Int'l Conf. on Modulated Semiconductor Structures
    • Place of Presentation
      Genova, Italy
    • Year and Date
      20070715-20
  • [Book] Advances in Solid State Physics 47 (Highly Spin-Polarized Tunneling in Fully Epitaxial Magnetic Tunnel Junctions with a Co-Based Full-Heusler Alloy Thin Film and a MgO Barrier) (R.Haug (Ed.)) (pp. 105-116)2008

    • Author(s)
      M. Yamamoto, T. Marukame, T. Ishikawa, K.-I. Matsuda, and T. Uemura
    • Total Pages
      105-116
    • Publisher
      Springer Berlin /Heidelberg

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Published: 2010-06-10   Modified: 2016-04-21  

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