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Study of spin injection and its device application in ferromagnetic/semiconductor hybrid system

Research Project

Project/Area Number 14076213
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionJapanese Advanced Institute of Science and Technology

Principal Investigator

YAMADA Syoji  Center for Nano Materoals and Technology, Prof, ナノマテリアルテクノロジーセンター, 教授 (00262593)

Co-Investigator(Kenkyū-buntansha) AKABORI Masashi  Center for Nano Materoals and Technology, Assoc., ナノマテリアルテクノロジーセンター, 助手 (50345667)
Project Period (FY) 2002 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥19,800,000 (Direct Cost: ¥19,800,000)
Fiscal Year 2005: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 2004: ¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 2003: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 2002: ¥3,800,000 (Direct Cost: ¥3,800,000)
Keywordsspin-orbit interaction / spin-injection / inverted heteroiunction / zero-field spin-splitting / narrow-gap semiconductor / spin transistor / side-gate / quantum computing device / 逆ヘテロ接合 / 細線 / ヘテロ接合 / 分子線エピタキシ / 新狭ギャップヘテロ接合 / スピン注入電極 / 電子ビーム蒸着 / 新狭ギャップヘテロ結合 / 2重バッファ構造
Research Abstract

We have three major targets in this research project ; a) Development of novel narrow-gap heterojunction materials, b) Realization of high efficient spin-injection, c) Optimum design and device fabrication of Rashba type spin transistor. The main results obtained here are as follows ;
1) By adopting thick InAlSb buffer structure, we have succeeded to grow modulation-doped InGaSb/InAlSb (In content~0.9) hetero-junction on (001) GaAs substrates. Highest low temperature mobility is 1.2 x 10^5 cm^2/Vsec for sheet electron density of 3x10^11/cm^2, which is comparable to the record value so far obtained. The values of spin-orbit coupling constant are within 20-30 x 1042 eVm, which are similar to those obtained in high In-content InGaAs/InAlAs heterojunctions. In addition, from the detailed analysis of the Zeeman spin-splitting a under high magnetic fields, Dresselhaus contribution is found to be dominate even under low magnetic fields. This result contrasts to that in the InGaAs/InAlAs system … More not entirely expected previously. This is the result confirmed first time in our group, although the origin of this important and interesting phenomenon is not fully clear at present
2) As an example of important structure toward the Rashba-type spin-FM' realization, we have fabricated InGaAs/InAlAs narrow wires with the gates in the both sides. And investigated the effect of the side-gate voltage on the Rashba spin-orbit interaction in those wires. When the gate voltage is small, the effect of horizontal electric field due to the side-gates are confirmed, but it is replaced by the effect of vertical electric field when the gate voltages become large. That is, the value of the spin-orbit coupling constant takes a minimum when the two-gate voltages applied the each side-gate are balanced. But it increases monotonically when we increase the negative side-gate voltages further. This suggests the possibility of controlling the spin-orbit interaction by the side-gates as well as by the top-gates and could be developed to realize the Q-bit devices based on this type of spin-FET
3) We have developed high In-content inverted InGaAs/InAlAs heterojunction as a promising candidate of the material, in which high spin-injection could be realized with keeping high electron mobility as well as large spin-orbit coupling constant. The samples with thin (< 60 nm) surface InGaAs channel thickness are grown and the mobilities and the spin-orbit coupling constants similar to those in the same material normal type heterojunctions were confirmed. In the spin-injection experiments, reduced contact resistances of ferromagnetic electrodes attached on the heterijunction surface and reproducible spin-valve signals were successfully confirmed. Less

Report

(5 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (29 results)

All 2007 2006 2005 2004 2003 Other

All Journal Article (22 results) Publications (7 results)

  • [Journal Article] Spin-orbit interaction in high-In content in GaAs/InAlAs inverted heterojunctions for Rashba spintronics devices2007

    • Author(s)
      H.K.Choi, Y.Kitta, T.Kakegawa, Y.Jeong, M.Akabori, T.Suzuki, S.Yamada
    • Journal Title

      Proc. 28^<th> Int Conf. on Physics of Semiconductors (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin-orbit interaction in high-In content InGaAs/InAlAs inverted heterojunctions for Rashba spintronics devices2007

    • Author(s)
      H.K.Choi, Y.Kitta, T.Kakegawa, Y.Jeong, M.Akabori, T.Suzuki, S.Yamada
    • Journal Title

      Proc. 28th Int. Conf. on Physics of Semiconductors

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation-limited electron transport in InSb grown on GaAs(001)2006

    • Author(s)
      T.Sato, T.Suzuki, S.Tomiya, S.Yamada
    • Journal Title

      Physica B 376-377

      Pages: 579-583

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation-limited electron transport in InSb grown on GaAs (001)2006

    • Author(s)
      T.Sato, T.Suzuki, S.Tomiya, S.Yamada
    • Journal Title

      Physica B 376-377

      Pages: 579-583

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin-polarized transport in adiabatic quantum point contact with strong Rashba spin-orbit interaction2005

    • Author(s)
      T.Kita, T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Solid State Communi., 136

      Pages: 479-483

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Quantum transport analysis and narrow-gap heterojunction growth for Rashba-type spintronics devices2005

    • Author(s)
      S.Yamada
    • Journal Title

      J. Sci. and Tech. Advanced Materials 6

      Pages: 406-410

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin-polarized transport in adiabatic quantum point contact with strong Rashba spin-orbit interaction2005

    • Author(s)
      T.Kita, T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Sold State Commun. 136

      Pages: 479-483

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Quantum transport analysis and narrow-gap heterojunction growth for Rashba-type spintronics, devices2005

    • Author(s)
      S.Yamada
    • Journal Title

      J. Sci. and Tech. Advanced Materials 6

      Pages: 406-410

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin-polarized transport in adiabatic quantum point contact with strong Rashba spin-orbit interaction2005

    • Author(s)
      T.Kita, T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Solid State Communi., 136,

      Pages: 479-483

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Side-gate control of Rashba spin-orbit interaction in InGaAs/InAlAs narrow channels2005

    • Author(s)
      S.Yamada, T.Kakegawa, M.Akabori
    • Journal Title

      Proc., I.6, 12^<th> Int Conf. on Narrow Gap Semiconductors

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Selection-rule breaking of Raman scattering in InSb thin films grown on GaAs (001)2005

    • Author(s)
      T.Sato, T.Suzuki, S.Yamada
    • Journal Title

      Proc., I.6, 12^<th> Int Conf. on Narrow Gap Semiconductors

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Side-Gate Control of Rashba Spin Splitting in a InGaAs/InALAs Heterojunction Narrow Channel : Toward Spin-Transistor-Based Qubits2005

    • Author(s)
      T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Proc. of 27^<th> Int.Conf. on Physics of Semiconductors

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Clear Spin-Valve Signals in Conventional NiFe/InGaAs 2DEG Hybrid Two-Terminal Structures2005

    • Author(s)
      M.Akabori, K.Suzuki, S.Yamada
    • Journal Title

      Proc. of 27^<th> Int.Conf. on Physics of Semiconductors

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Side-gate control of Rashba spin splitting in a InGaAs/InAlAs heterojunction narrow channel : toward spin-transistor-based Qubits2004

    • Author(s)
      T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Proc. 27^<th> Int. Conf. on Physics of Semiconductors Part B

      Pages: 1297-1298

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Clear Spin Valve Signals in Conventional NiFe/In_<0.75>Ga_<0.25>As-2DEG Hybrid Two-Terminal Structures2004

    • Author(s)
      M.Akabori, K.Suzuki, S.Yamada
    • Journal Title

      Proc. 27^<th> Int. Conf. on Physics of Semiconductors Part B

      Pages: 1373-1374

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin-related transport in one-dimensional conductors made at high In-content InGaAs/InAlAs hetero-junctions2004

    • Author(s)
      S.Yamada
    • Journal Title

      J. Sci. and Tech. Advanced Materials 5

      Pages: 301-304

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Side-gate control of Physics of Rashba spin splitting in a InGaAs/InAlAs heterojunction narrow channel : toward spin-transistor-based Qubits2004

    • Author(s)
      T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Proceedings of 27th Int. Conf. on Semiconductors, Part B

      Pages: 1297-1298

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Clear Spin Valve Signals in Conventional NiFe/In0.75Ga0.25As-2DEG Hybrid Two-Terminal Structures2004

    • Author(s)
      M.Akabori, K.Suzuki, S.Yamada
    • Journal Title

      Proceedings of 27th Int. Conf. on Semiconductors, Part B

      Pages: 1373-1374

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Spin-related transport in one-dimensional conductors made at high In-content InGaAs/InAlAs hetero-functions2004

    • Author(s)
      S.Yamada
    • Journal Title

      Int.J.Sci. and Tech.Advanced Materials 5

      Pages: 301-304

    • Related Report
      2004 Annual Research Report
  • [Journal Article] High quality highly mismatched InSb films grown on GaAs substrate via thick AlSb and InAlSb step-graded buffers2004

    • Author(s)
      T.Sato, M.Akabori, S.Yamada
    • Journal Title

      Proc. of 11^<th> Modulated Semiconductor Structures (MSS-11)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Spin-polarized transport in Rashba quantum point contacts2004

    • Author(s)
      T.Kita, T.Kakegawa, M.Akabori, S.Yamada
    • Journal Title

      Physica E 22

      Pages: 464-467

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Spin transport and injection in high-In content InGaAs/InAlAs heterostructure2003

    • Author(s)
      S.Yamada
    • Journal Title

      Int.J.Sci. and Tech.Advanced Materials 4

      Pages: 77-80

    • Related Report
      2004 Annual Research Report
  • [Publications] S.Yamada: "Spin transport and injection in high-In-content InGaAs/InAlAs heterostructures"Sci. and Tech.Advnaced Materials. Vol.4,No.1. 77-80 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Fujii, Y.Morikami, T.Ohyama, S.Gozu, S.Yamada: "Observation o a large spin-orbit interaction in photoexcited InGaAs/InAlAs heterostructures"J.Superconductivity. 16. 469-472 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Kita, T.Kakegawa, M.Akabori, S.Yamada: "Spin-polarized transport in Rashba quantum point contacts"Physica E. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Sato, M.Akabori, S.Yamada: "High quality highl mismatched InSb films grown on GaAs substrate via thick AlSb and InAlSb step-graded buffers"Physica E. (in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Sato, S.Gozu, T.Kita, S.Yamada: "Study for realization of spin-polarized field effect transistor"PHYSICA E. 12. 399-402 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Kita, S.Gozu, Y.Sato, S.Yamada: "Observation of e2/h conductance steps in a side-gate point contact on InGaAs/InAlAs heterostructure"Journal of Superconductivity. 15. (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Ochiai, T.Tsuchiya, S.Yamada: "Zero-magnetic-field spin splitting of conduction subband in InGaAs/InAlAs and GaAs/AlGaAs quantum wells"Journal of Superconductivity. 15. (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2018-03-28  

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