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Optical Spin Injection and Carrier Transport in Hybrid Nanostructures of Semiconductors and Magnetic Metals

Research Project

Project/Area Number 13450002
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionTohoku University

Principal Investigator

OKA Yasuo  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (60013520)

Co-Investigator(Kenkyū-buntansha) NISHIBAYASHI Kazuhiro  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (20361181)
TOMITA Takuro  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Research Associate, 多元物質科学研究所, 助手 (90359547)
MURAYAMA Akihiro  Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (00333906)
高橋 昌明  東北大学, 多元物質科学研究所, 助手 (80006147)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2003: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2002: ¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 2001: ¥4,900,000 (Direct Cost: ¥4,900,000)
Keywordsspin injection / semiconductors / magnetic semiconductors / magnetic materials / spin electronics / nanostructures / lithography / photoluminescence
Research Abstract

The objective of the research is following:
1.Fabrication of hybrid nanostrctures of quantum wires, quantum dots and quantum wells, which are composed of II-VI compound diluted magnetic semiconductors and magnetic metals.
2.Study of optical spin injection and spin transport in the hybrid nanostructures and application for spin electronic devices. For the above objective, we have fabricated the quantum nanostructures and hybrid nanostructures with CdTe, CdSe, ZnTe, ZuSe and magnetic materials of Mn and Co by using molecular expitaxy and electron beam lithography methods. Fabricated quantum and hybrid nanostructures are studied by femtosecond laser spectroscopy in high magnetic fields. Spin injection processes are investigated in CdTe-CdMnTe double quantum wells, where the transient photoluminescence of quantum-well excitons shows that spin injection and spin relaxation processes. Spin switching processes are clarified in ZnTe-ZnMnTe spin superlattices, where the distribution of up-and dow … More n-spin states of excitons is spatially separated in Zute and ZnMnTe layers by the external magnetic fields. The lowest spin state of excitons is modified from that of the ZnTe layer to that of the ZuMnTe due to the large Zeeman splitting of the exciton spins in the ZnMnTe layer. From the transient characteristics of the exciton photoluminescence, the reverse spin injection process (spin switching) is confirmed and the spin injection times are determined. Ultrafast spin dynamics of excitons is investigated in these diluted magnetic nanostructures by transient pump-probe spectroscopy. The spin dynamics in the high density electron-hole plasma, excitons, and Mn ions are clarified in the femotsecond to nanosecond time region. Fabrication of hybrid nanostructures is made by using electron beam lithography technique. The diluted magnetic quantum wells in the hybrid structures are affected by the magnetic field, which is induced by the ferromagnetic Co wires neighboring to the quantum wells. These phenomena have high possibilities for spin electronic applications. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report

Research Products

(31 results)

All Other

All Publications

  • [Publications] K.Kayanuma: "Spin injection and spin switching of excitons in coupled quantum wells of diluted magnetic semiconductors"Physica B. 340-342. 882-885 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Shirotori: "Magnetic-field-induced level crossing and the spin dynamics of excitons in Zn_<1-x>Mn_xTe/ZnTe quantum wells"J.Superconductivity, incorporating Novel Magnetism. 16. 457-460 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Sakuma: "Sub-micron scale hybrid structures of diluted magnetic semiconductor quantum wells with ferromagnetic Co wires"J.Appl.Phys.. 94. 6423-6429 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Z.H.Chen: "Spin dynamics of excitons and magnetic ions in Cd_<1-x>Mn_xTe/Cd_<1-y>Mg_yTe quantum wells"Physica B. 340-342. 890-894 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] A.Uetake: "Exciton dynamics in quantum nano-structures of II-VI diluted magnetic semiconductors fabricated by electron-beam lithography"Phys.Stat.Sol.(c). 241. 941-944 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Sakurai: "Ultrafast exciton spin dynamics in Cd_<1-x>Mn_xTe quantum wells studied by transient pump-probe spectroscopy"Phys.Stat.Sol.(c). 241. 981-984 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kayanuma: "Spin injection and spin switching of excitons in coupled quantum wells of diluted magnetic semiconductors"Physica B. 340-342. 882-885 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.Shirotori: "Magnetic-field-induced level crossing end the spin dynamics of excitons in Zn_<1-x>Mn_xTe/ZnTe quantum wells"J. Superconductivity, incorporating Novel Magnetism. 16. 457-460 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Sakuma: "Sub-micron scale hybrid structures of diluted magnetic semiconductor quantum wells with ferromagnetic Co wires"J.Appl.Phys.. 94. 6423-6429 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Z.H.Chen: "Spin dynamics of excitons and magnetic ions in Cd_<1-x>Mn_xTe/Cd_<1-y>Mg_yTe quantum wells"Physica B. 340-342. 890-894 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] A.Uetake: "Exciton dynamics in quantum nano-structures of II-VI diluted magnetic semiconductors fabricated by electron-beam lithography"Phys.Stat.Sol.(c). 241. 941-944 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Sakurai: "Ultrafast exciton spin dynamics in Cd_<1-x>Mn_xTe quantum wells studied by transient pump-probe spectroscopy"Phys.Stat.Sol.(c). 241. 981-984 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Kayanuma, S.Shirotori, Z.H.Chen, T.Tomita, A.Murayama, Y.Oka: "Spin injection and spin switching of excitons in coupled quantum wells of diluted magnetic semiconductors"Physica B. 340-342. 882-885 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Shiratori, K.Kayanuma, T.Tomita, Z.H.Chen, A.Murayama, Y.Oka: "Magnetic-field-induced level crossing and the spin dynamics of excitons in Zn_<1-x>Mn_xTe/ZnTe quantum wells"J.Superconductivity, incorporating Novel Magnetism. 16. 457-460 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Sakuma, K.Hyomi, I.Souma, A.Murayama, Y.Oka: "Sub-micron scale hybrid structures of diluted magnetic semiconductor quantum wells with ferromagnetic Co wires"J.Appl.Phys.. 94. 6423-6429 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Z.H.Chen, H.Sakurai, K.Seo, K.Kayanuma, T.Tomita, A.Murayama, Y.Oka: "Spin dynamics of excitons and magnetic ions in Cd_<1-x>Mn_xTe/Cd_<1-y>Mg_yTe quantum wells"Physica B. 340-342. 890-894 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] A.Uetake, H.Ikeda, T.Asahina, M.Sakuma, K.Hyomi, T.Tomita, A.Muratama, Y.Oka: "Exciton dynamics in quantum nano-structures of II-VI diluted magnetic semiconductors fabricated by electron-beam lithography"Phys.Stat.Sol.(c). 241. 941-944 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Sakurai, K.Seo, Z.H.Chen, K.Kayanuma, T.Tomita, A.Murayama, Y.Oka: "Ultrafast exciton spin dynamics in Cd_<1-x>Mn_xTe quantum wells studied by transient pump-probe spectroscopy"Phys.Stat.Sol.(c). 241. 981-984 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Hyomi, A.Murayama, Y.Oka, C.M.Falco: "Misfit Strain and Magnetic Anisotropies in Ultrathin Co Films Hetero-Epitaxially Grown on Au/Cu/Si(111)"J.Crystal Growth. 235. 567-571 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Kayanuma, M.C.Debnath, I.Souma, Z.H.Chen, A.Murayama, Y.Oka: "Exciton Spin Injection in CdTe/Cd_<1-x>Mn_xTe Double Quantum Wells"Phys.Stat.Sol.(b). 229. 761-764 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.C.Debnath, Z.H.Chen, I.Souma, K.Sato, A.Murayama, Y.Oka: "Spin-Dependent Carrier Confinements and Radiative Recombinations in Zn_<1-x>Mn_xTe/Zn_<1-y>Mg_yTe Spin Superlattices"Phys.Stat.Sol.(b). 229. 695-699 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Hyomi, A.Murayama, U.Hiller, Y.Oka, C.M.Falco: "Surface Magnetic Anisotropy of Co(OOO1) and Effects of Ultrathin Cu-Overlayers Studied by In-Situ Spin-Wave Brillouin Light Scattering"Appl.Phys.Lett.. 80. 282-284 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Oka, K.Kayanuma, S.Shirotori, A.Murayama, I.Souma, Z.H.Chen: "Excitonic Properties and Dynamics in Diluted Magnetic Semiconductor Quantum Nanostructures"Nonlinear Optics. 29. 491-499 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Oka, K.Kayanuma, S.Shirotori, A.Murayama, I.Souma, Z.H.Chen: "Magneto-Optical Properties and Exciton Dynamics in Diluted Magnetic Semiconductor Nanostructures"J.Luminescence. 100. 175-190 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Nogaku, J.X.Shen, R.Pittini, T.Sato, Y.Oka: "transient-Level Crossing of Free and Bound Excitonic Magnetic Polarons in Cd_<1-x>Mn_xTe Single Crystals"Physical Review B. 63. 153314-1-153314-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Z.H.Chen, M.C.Debnath, K.Shibata, t.Saitou, T.Sato, Y.Oka: "Modification of Exchange Interaction Parameters by Wire Width in Cd_<0.95>Mn_<0.05>Te/Cd_<0.90>Mg_<0.10>Te Quantum Wires"Journal of Applied Physics. 89・11. 6701-6703 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Kayanuma, E.Shirado, M.C.Debnath, I.Souma, Z.Chen, Y.Oka: "Spin Transport Dynamics of Excitons in CdTe/Cd_<1-x>Mn_xTe Quantum Wells"Journal of Applied Physics. 89・11. 7278-7280 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Kayanuma, E.Shirado, M.C.Debnath, I.Souma, S.Permogorov, Y.Oka: "Tunneling of Spin Polarized Excitons in Double Quantum Wells of Cd_<1-x>Mn_xTe and CdTe"Physical E. 10. 295-299 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] J.X.Shen, R.Pittini, Y.Oka: "Strong Anti-Stokes Photoluminescence of GaAs Free Excitons in GaAs/Ga_<1-x>Al_xAs Heterojunctions"Physical Review B. 64. 195321-1-195321-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.C.Debnath, I.Souma, M.Takahashi, T.Sato, R.Pittini, F.Sato, M.Tanaka, Y.Oka: "Excitonic Properties of Cd_<1-x>Mn_xTe Quantum Wells Grown by Molecular Beam Epitaxy"Journal of Crystal Growth. 229. 109-113 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 岡 泰夫: "ナノマテリアルの最新技術(シーエムシー):小泉他編"ナノコンポジットによる新機能付与-スピンエレクトロニクス(半導体と磁性体の複合薄膜、希薄磁性半導体)-. 331 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-03-31   Modified: 2016-04-21  

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