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Local tunnel spin transport of ballistic electron emission from a tip of a probe microscope

Research Project

Project/Area Number 13650002
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

ANDO Yasuo  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (60250726)

Co-Investigator(Kenkyū-buntansha) KUBOTA Hitoshi  Tohoku University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (30261605)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsFerromagnetic tunnel junction / Scanning probe microscope / Low resistance / Insulator / Local tunnel conduction / Spin dependent transport / Ballistic electron emission microscope / Scanning tunnel microscope
Research Abstract

Ferromagnetic tunnel junctions with low resistance were fabricated using plasma, radical and natural oxidation. The thickness of the Al was 0.6nm - 0.8nm. Different initial oxidation process for the junctions affected the electrical properties on heat treatment of the junctions. In order to prepare the higher quality junctions, the bottom electrode with the buffer of Ag/Cu was grown on a single crystal Si(111) substrate. The junction was appeared to show low bias dependence of tunnel magnetoresistance (TMR) ratio.
The initial oxidation process with different oxidation methods was investigated by using a scanning tunnel microscope. The structure was amorphous for the surface oxidized by radical or pure oxygen, while the surface oxidized by plasma was the reconstruction structure of crystal Al_2O_3. For the deep understanding for the structure affecting the transport properties, ballistic electron emission microscope was made. The current image reflected by the homogeneity of the insulator was successfully obtained.
The interface between the insulator and the ferromagnetic electrode was analyzed by using inelastic electron tunneling spectroscopy. The spectra showed a sharp peak at zero-bias and a broad peak around 20 mV corresponding to the impurity and magnon scattering, respectively. A little insertion of the non-magnetic materials resulted in the increase of the zero-bias peak and the decrease of the magnon peak. The spectra for the junction with epitaxially grown electrode showed a low intensity of the zero-bias scattering, suggesting of the decrease of the mount of the impurity at the interface.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (42 results)

All Other

All Publications (42 results)

  • [Publications] Masamitsu Hayashi: "Scanning Tunneling Microscopy Observation of the Initial State of Oxidation in Ferromagnetic Tunnel Junctions"Japanese Journal of Applied Physics. 40. L1317-L1319 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuo Ando: "Local transport properties of ferromagnetic tunnel junctions"J.Magn.Magn.Mater.. 226-230. 924-925 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Junichirou Murai: "Magnon excitation of CoFe/Al-oxide/CoFe ferromagnetic tunnel junctions"J.Magn.Magn.Mater.. 226-230. 922-923 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 安藤 康夫: "スピンが担うエレクトロニクスの未来"パリティ. 16・12. 23-29 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Kubota: "Magnetoresistance and Dipole Shift of Ultrasmall Magnetic Tunnel Junctions Characterized by Conducting Atomic Force Microscopy"Japanese Journal of Applied Physics. 41. L180-L182 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Andrew C.C.Yu: "Microstructural and magnetic characteristics of IrMn exchange-biased tunnel junctions"J.Magn.Magn.Mater.. 240. 130-133 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuo Ando: "Growth mechanism of thin insulating layer in ferromagnetic tunnel junctions prepared using various oxidation methods"Journal of Physics D. 35. 2415-2421 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 井浦 聡則: "ラジカル酸化法で作製した高耐熱強磁性トンネル接合"日本応用磁気学会誌. 26. 839-842 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宮崎 照宣: "トンネル磁気抵抗効果とスピンエレクトロニクスの展開"固体物理. 38. 109-124 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 井浦 聡則: "下部磁性層を酸化して作製したトンネル接合の高耐熱特性"日本応用磁気学会誌. 27. 303-306 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuo Ando: "Interface characterization of magnetic tunnel junctions by using tunneling spectroscopy"Journal of Applied Physics. 93. 7023-7025 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Terunobu Miyazaki: "Recent Development of MRAM Technology"Journal of Magnetics. 8. 36-44 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J.H.Yu: "Electron transport properties in magnetic tunnel junctions with epitaxial NiFe (111) ferromagnetic bottom electrodes"Appl.Phys.Lett.. (In press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Hitoshi Kubota: "Size dependence of switching field of magnetic tunnel junctions down to 50nm scale"Journal of Applied Physics. 93. 8370-8372 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J.H.Yu: "Magnetic tunnel junctions with high magnetoresistance and small bias voltage dependence using epitaxial NiFe(111) ferromagnetic bottom electrodes"Journal of Applied Physics. 93. 8555-8557 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Hayashi, Y. Ando, T. Miyazaki: "Scanning Tunneling Microscopy Observation of the Initial State of Oxidation in Ferromagnetic Tunnel Junctions"Jpn. J. Appl. Phys.. 40. 1317-1319 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Ando, M. Hayashi, M. Kamijo, H. Kubota, T. Miyazaki: "Local transport properties of ferromagnetic tunnel junctions"J. Magn. Magn. Mater.. 226-230. 924-925 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J. Murai, Y. Ando, T. Daibou, K. Yaoita, H. F. Han, T. Miyazaki: "Magnon excitation of CoFe/Al-oxide/CoFe ferromagnetic tunnel junctions"J. Magn. Magn. Mater.. 226-230. 922-923 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Ando: "Future of electronics pioneered by spin"Parity. 16-12. 23-29 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Kubota, G. Reiss, H. Bruckl, W. Schepperi, J. Weckker, G. Gieres: "Magnetoresistance and Dipole Shift of Ultrasmall Magnetic Tunnel Junctions Characterized by Conducting Atomic Force Microscopy"Jpn. J. Appl. Phys.. 41. 180-182 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Andrew C. C. Yu, X. F. Ham, J. Murai, Y. Ando, T. Miyazaki, K. Hiraga: "Microstructural and magnetic characteristics of IrMn exchange-biased tunnel junctions"J. Magn. Magn. Mater.. 240. 130-133 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Ando, M. Hayashi, S. Iura, K. Yaoita, C. C. Yu, H. Kubota, T. Miyazaki: "Growth mechanism of thin insulating layer in ferromagnetic tunnel junctions prepared using various oxidation methods"J. Phys. D. 35. 2415-2421 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Iura, H. Kubota, Y. Ando, T. Miyazaki: "Enhancement of Thermal Stability in Ferromagnetic Tunnel Junctions Prepared by the Radical Oxidation Method"J. Magn. Soc. Jpn.. 26. 839-842 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Miyazaki, Y. Ando, H. Kubota: "Tunnel magnetoresistance and spinelectronics"Solid State Physics. 38. 109-124 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Iura, H. Kubota, Y. Ando, T. Miyazaki: "Thermal Stability of Tunnel Junctions with additional oxidation at the surface of the bottom electrode"J. Magn. Soc. Jpn.. 27. 303-306 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Ando, M. Hayashi, M. Oogane, H. Kubota, T. Miyazaki: "Interface characterization of magnetic tunnel junctions by using tunneling spectroscopy"J. Appl. Phys.. 93. 7023-7025 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Miyazaki, Y. Ando, H. Kubota: "Recent Development of MRAM Technology"Journal of Magnetics. 8. 36-44 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J. H. Yu, H. M. Lee, Y. Ando, T. Miyazaki: "Electron transport properties in magnetic tunnel junctions with epitaxial NiFe (111) ferromagnetic bottom electrodes"Appl. Phys. Lett.. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Kubota, Y. Ando, T. Miyazaki, G. Reiss, H. Bruckl, W. Schepper: "Size dependence of switching field of magnetic tunnel junctions down to 50 nm scale"J. Appl. Phys.. 93. 8370-8372 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] J. H. Yu, H. Lee, M. Hayashi, H. Kubota, Y. Ando, T. Miyazaki: "Magnetic tunnel junctions with high magnetoresistance and small bias voltage dependence using epitaxial NiFe(111) ferromagnetic bottom electrodes"J. Appl. Phys.. 93. 8555-8557 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuo Ando: "Growth mechanism of thin insulating layer in ferromagnetic tunnel junctions prepared using various oxidation methods"Journal of Physics D. 35. 2415-2421 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 井浦 聡則: "ラジカル酸化法で作製した高耐熱強磁性トンネル接合"日本応用磁気学会誌. 26. 839-842 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 宮崎 照宣: "トンネル磁気抵抗効果とスピンエレクトロニクスの展開"固体物理. 38. 109-124 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 井浦 聡則: "下部磁性層を酸化して作製したトンネル接合の高耐熱特性"日本応用磁気学会誌. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yasuo Ando: "Interface characterization of magnetic tunnel junctions by using tunneling spectroscopy"Journal of Applied Physics. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Masamitsu Hayashi: "Scanning Tunneling Microscopy Observation of the Initial State of Oxidation in Ferromagnetic Tunnel Junctions"Jpn. J. Appl. Phys.. 40. L1317-L1319 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yasuo Ando: "Local transport properties of ferromagnetic tunnel junctions"J.Magn. Magn. Mater.. 226-230. 924-925 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Junichirou Murai: "Magnon excitation of CoFe/Al-oxide/CoFe ferromagnetic tunnel junctions"J. Magn. Magn. Mater.. 226-230. 922-923 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 安藤康夫: "スピンが担うエレクトロニクスの未来"パリティ. 16・12. 23-29 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 林将光: "強磁性トンネル接合のスピン依存局所伝導特性"日本応用磁気学会誌. 25. 759-762 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 矢尾板和也: "プラズマ酸化法による低抵抗強磁性トンネル接合の作製"日本応用磁気学会誌. 25. 771-774 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Kubota: "Magnetoresistance and dipole Shift of Ultrasmall Magnetic Tunnel Junctions Characterized by conducting Atomic Force・Microscopy"Jpn. J. Appl. Phys.. 41. L180-L182 (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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