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1995 Fiscal Year Final Research Report Summary

Formation of nanoconstriction in thin insulating films by applying electric field.

Research Project

Project/Area Number 06650723
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionNagaoka University of Technology

Principal Investigator

ISHIGURO Takashi  Dept. of Electrical Engin., Nagaoka University of Technology, Associate Professor, 工学部, 助教授 (10183162)

Co-Investigator(Kenkyū-buntansha) HAMASAKI Katsuyoshi  Dept. of Electrical Engin., Nagaoka University of Technology, Professor, 工学部, 教授 (40143820)
Project Period (FY) 1994 – 1995
KeywordsField Evapolation / Quantum Wire / Thin Film / Insulating Thin Film / Quantum Effect
Research Abstract

Metal (Al)/insulator (SiO_2 and/or MgO)/metal (Au) stacking structure with thin (5-20nm) insulating films have been fabricated. The electrically insulating state changes into conductive state by applying d.c. voltage.
The threshold voltage from insulating state to conductive state (V_t) has been measured as a function of the thickness for SiO_2 (t_<SiO2>) and MgO (t_<MgO>) films, respectively. Results are as follows : for SiO2 films, V_t [V] =0.7 [V/nm] ・t_<SiO2> [nm], and for MgO films, V_t [V] =0.44 [V/nm]・t_<MgO> [nm].
The Au anodic surfaces before and after applying field have been observed using scanning tunneling microscope (STM). The morphology on the Au anodic surface changed for the each process to form nanoconstrictions in the insulating films. Present experiment revealed the fact that the electrical change in the MIM structure form insulating to conducting related the formation of nanoconstriction due to the deformation of the surface of anodic material.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] H.Abe et.al.: "Fabrication of Superconducting Quantum Interference Device with Tin-Film Quantum Point Contacts." Jpn.J.Appl.Phys.33. 7210-7213 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Takada et al.: "Quasiparticle Characteristics and Noise Properties of Superconductor-Normal Metal-Superconductor Quantum Well Devices." Jpn.J.Appl.Phys.34. 1401-1404 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Misaki.et al.: "Crossover of Noise in Superconducting Mesoscopic Devices." Extended Abst.of the 1995 Int'l Conf.on Solid State Devices and Materials. 407-409 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ishiguro et al.: "STM observation of nanoconstriction in thin insulating films formed by applying electric field." J.Appl.Phys.(submitted).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Abe, K.Hamasaki, and T.Ishiguro: "Fabrication of Superconducting Quantum Interference Device with Thin-Film Quantum Point Contacts" Jpn. J.Appl. Phys.33. 7210-7213 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Takada, T.Ikuta, A.Tachibana, T.Fukumoto, M.Hatle, and K.Hamasaki: "Quasiparticle Characteristics and Noise Properties of Superconductor-Normal Metal-Superconductor Quantum Wall Devices." Jpn. J.Appl. Phys.34. 1401-1404 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Misaki, A.Saito, and K.Hamasaki: "Crossover of Noise in Superconducting Mesoscopic Devices." Extended Abst. of the 1995 Int'l Conf. on Solid State Devices and Materials.407-409 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Ishiguro, S.Ikeda, and K.Hamasaki: "STM Observation of Nanoconstriction in Thin Insulating Films Formed by Applying Electric Field." J.Appl. Phys.(submitted Nov. 1995).

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

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Published: 1997-03-04  

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