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2003 Fiscal Year Final Research Report Summary

Preparation of Ferromagnetic Nano-dot system and Its Magneto-Resistance

Research Project

Project/Area Number 13650708
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionHokkaido University

Principal Investigator

ARITA Masashi  Hokkaido Univ., Grad.School of Eng., Associate Prof., 大学院・工学研究科, 助教授 (20222755)

Project Period (FY) 2001 – 2003
KeywordsTunneling Junction / Ferromagnetic Nano-Paricles / Granular Films / Magneto-Resistance / Metal Nano-Wire / Quantum Conductance / Transmission Electronmicroscopy / Scanning Tunnelin Microscopy
Research Abstract

For the study of (spin dependent) electric properties of nano materials, the production of nano-electrodes, the design of special attatchment for transmission electron microscopy (TEM) and the quantum conductance (QC) of ferromagnetic nano-particle systems and nano-wires were investigated. The production of nano-structures and selection of the conduction paths were successfully carried out inside TEM. The set of results will contribute to the future research on the spin dependent conduction of nano-structured materials.
1.Production of Nano-Electrodes : By the sputtering method using diamond particles as the mask, electrodes having nano-scaled tip and the length of several tens of μm could reproducibly prepared. Using these electrodes, conduction experiments inside TEM became possible.
2.Design and Production of TEM Holders for Nano-Conduction Experiments : TEM holders to measure the nano-current between nano-dots were produced. Two electrodes can be loaded in the holder. Nano-manufactun … More ng and adequate selection of measuring positions were realized in nano-scale.
3.Electric Measurements of Limited Number of Fe Nano-Particles : Using the 10nm thick Fe-SrF_2 films as the sample where Fe particles are embedded in SrF_2, the Coulomb blockade effect was detected. The sample was attached by the Au counter electrode, I-V measurements were performed at room temperature. When the contact area was less than 700nm^2, the Coulomb blocade of 0.4V was detected. The number of particles in this area is about 10.
4.Quantum Conductance of Au and Fe Nano-Wires : Nano-wies of non-magnetic Au and ferro-magnetic Fe were studied inside TEM. In both cases, QC with half integer steps was recognized. The appearance of this phenomenon was influenced by the broken speed of wires, the magnetic field and the bias voltage. By adequate selection of experimental conditions, the wire showing the half integer step was kept more than 1 second. This is long enough to study the relationship between the wire shape and QC. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] R.Hirose: "Tip production technique to form ferromagnetic nanodots"Materials Science and Eng.C. 23. 927-930 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Arita: "Changes in magnetic microsturcture and resistivity of permaloy thin films"Proc.Symp.Adv.Res.Energy Technol.2003. 293-294 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Arita: "In-situ experiment of Lorentz TEM and magnetoresistance measurements on a permalloy thin film"Trans.Magn.Soc.Japn.. 4. 9-12 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Arita: "Conductance quantization of nano-structured materials measured in TEM"2004エネルギー先端工学シンポジウム講演要旨集. 79-80 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 広瀬 龍介: "TEMを用いたナノ微粒子の伝導測定に関する研究"日本物理学会講演概要集(第59回年次大会). 902-902 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Hirose et al.: "Tip production technique to form ferromagnetic nanodots"Materials Science and Eng.C.. 23. 927-930 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Arita et al.: "Changes in magnetic microstructure and resistivity of permalloy thin films"Proc.Symp.Adv.Res.Energy Technol.. 2003. 293-294 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Arita et al.: "In-situ experiment of Lorentz TEM and magnetoresistance measurements on a permalloy thin film"Trans.Magn.Soc.Japn.. 4. 9-12 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Arita et al.: "Conductance quantization of nano-structured materials measured in TEM"Proc.Symp.Adv.Res.Energy Technol.. 2004(in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Hirose et al.: "Conductance measurements of a nano-particle system performed inside TEM"Abst.Phys.Soc.Japn.(59th meeting). 902 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tajiri et al.: "G_o/2 conductance of gold nano-wires"Abst.Japn.Inst.Met.. March. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Hosoya et al.: "Magnetoresistance in granular Fe-SrF_2 films"Abst.E-MRS Spring meeting. (accepted). (2004)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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