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Current-Induced Instability in the Quantized Conductance States of MetaNanowires and Their Reinforcement by Alloying

Research Project

Project/Area Number 14340091
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

SAKAI Akira  Kyoto University, International Innovation Center, Professor, 国際融合創造センター, 教授 (80143543)

Co-Investigator(Kenkyū-buntansha) KUROKAWA Shu  Kyoto University, International Innovation Center, Research Associate, 国際融合創造センター, 助手 (90303859)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥15,000,000 (Direct Cost: ¥15,000,000)
Fiscal Year 2003: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2002: ¥11,600,000 (Direct Cost: ¥11,600,000)
KeywordsMetal nanocontacts / Single-atom contacts / Current-induced instability / Fracture conductance / Critical current density / 量子化コンダクタンス / 電流誘起脆性 / エレクトロマイグレーション / 金合金接点
Research Abstract

Metal nanocontacts, single-atom contacts consisting of only one atom in particular are found to become unstable when they are subject to high bias/high-current conditions. This research, conducted through 2002-2003 fiscal years, was to study experimentally this current induced instability in metal nanocontacts, clarify its mechanism(s), and investigate whether alloying suppresses the instability or not Main results obtained in this work are listed below.
1. In Au, Ag, Cu, and Al contacts, the formation probability p of single-atom contacts (SACs) decreases with increasing bias and vanishes at a critical bias V^<bc>. Under higher biases/currents, a contact shrinking in size thus becomes more unstable, leaving less chance to be a SAC. The value of V^<bc> is 〜2.3V for p_<Au> and 0.6-0.8 V for p_<Ag>, p_<Cu>, and P_<Al>, respectively. Despite the difference in V^<bc>, all these ps show a universal bias dependence, indicating an instability mechanism common to these four metals
2. Experiments … More on the fracture conductance of noble metal nanocontacts have ervealed the existence of a critical current density for contact rupture. Au, Ag, and Cu nanocontacts have similar values for their critical current density, which is the order of 10^<10>A/cm^2. When one shrinks a contact by necking deformation, the contact becomes unstable and fractures once the contact current density exceeds the critical value.
3. However, some relatively stable contacts may survive the instability and continue the deformation to become a SAC. Therefore, the SAC formation probability is basically a survival rate of such a contact through its deformation under unstable condition. This new interpretation of p can account for its observed bias dependence.
4. Ag and Cu nanocontacts show another type of instability which dominates in a low conductance regime and does not appear in Au. The existence of this new instability provides the reason why p_<Ag> and p_<Cu> have lower V_<bc> than that of Au.
5. SAC formation probabilities of AuPd and AuPt alloys have different bias dependence from those of AuAg and AuCu alloys and diminish more rapidly with increasing the bias. It is not clear at this time what alloying effects bring about this difference in ps of four alloys. Less

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Takeshi Minowa: "Conductance of Pd Single-Atom Contacts"Applied Surface Science. 掲載決定. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii: "High-bias conductance of atom-sized Cu contacts"Thin Solid Films. 掲載決定. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii: "Current-induced Instability in Ag and Cu Nanocontacts"e-Journal of Surface Science and Nanotechnology. 2. 155-159 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii: "Alloying effects on the 1G_0 contact of Au"Applied Surface Science. 掲載決定. 125-130 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii: "Stability of Atom-sized Metal Contacts under High Biases"e-Journal of Surface Science and Nanotechnology. 2. 125-130 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Jun-ichi Mizobata: "High-bias conductance of atom-sized Al contacts"Physical Review B. 68. 155428 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takeshi Minowa, Akihiro Fujii, Masashi Takeda, Shu Kurokawa, Akira Sakai: "Conductance of Pd Single-Atom Contacts"Applied Surface Science. (To be published ). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii, Atsushi Kusuda, Jun-ichi Mizobata, Takeshi Minowa, Shu Kurokawa, Akira Sakai: "High-bias conductance of atom-sized Cu contacts"Thin Solid Films. (To be published). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii, Shu Kurokawa, Akira Sakai: "Current-induced Instability in Ag and Cu Nanocontacts"e-Journal of Surface Science and Nanotechnology. 2. 155-159 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii, Ryohei Ochi, Shu Kurokawa, Akira Sakai: "Alloying effects on the 1G_O contact of Au"Applied Surface Science. 228. 207-212 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii, Jun-ichi Mizobata, Shu Kurokawa, Akira Sakai: "Stability of Atom-sized Metal Contacts under High Biases"e-Journal of Surface Science and Nanotechnology. 2. 125-130 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Jun-ichi Mizobata, Akihiro Fujn, Shu Kurokawa, Akira Sakai: "High-bias conductance of atom-sized Al contacts"Physical Review B. 68. 155428 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Jun-ichi Mizobata, Akihiro Fujii, Shu Kurokawa, Akira Sakai: "Conductance of Al Nanocontacts under High Biases"Japanese Journal of Applied Physic. 42. 4680-4683 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Enomoto, Jun-ichi Mizobata, Shu Kurokawa, Akira Sakai: "Quantized conductance in AuAg nanocontacts under high biases"Surface Science. 514. 182-186 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Enomoto, Shu Kurokawa, Akira Sakai: "Quantized conductance in Au-Pd and AuAg alloy nanocontacts"Physical Review B. 65. 125410 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiro Fujii: "High-bias conductance of atom-sized Cu contacts"Thin Solid Films. (掲載決定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Akihiro Fujii: "Stability of Atom-sized Metal Contacts under High Biases"e-Journal of Surface Science and Nanotechnology. 2. 125-130 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Akihiro Fujii: "Alloying effects on the 1G0 contact of Au"Applied Surface Science. (掲載決定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Jun-ichi Mizobata: "High-bias conductance of atom-sized Al contacts"Physical Review B. 68. 155428 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Jun-ichi Mizobata: "Conductance of Al Nanocontacts under High Biases"Japanese Journal of Applied Physics. (掲載決定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Akihiro Enomoto: "Quantized conductance in AuAg nanocontacts under high biases"Surface Science. 514. 182-183 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Akihiro Enomoto: "Quantized conductance in Au-Pd and Au-Ag alloy nanocontacts"Physical Review B. 65. 125410 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2020-05-15  

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