Study of current-induced break of metal nanocontacts and its application for fabricating nano-gapped electrodes
| Project/Area Number |
17310072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanomaterials/Nanobioscience
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| Research Institution | Kyoto University |
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Principal Investigator |
SAKAI Akira Kyoto University, Graduate Schad ofEngineering, Professor (80143543)
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| Co-Investigator(Kenkyū-buntansha) |
KUROKAWA Shu Kyoto Univ., Graduate Schcol of Engineering, Associate Professor (90303859)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥14,360,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2005: ¥11,300,000 (Direct Cost: ¥11,300,000)
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| Keywords | Metal nanocontacts / Current-induced contact break / Break conductance / Break voltage / Mechanically controllable break junction / Effective contact temperature / Conductance two-level fluctuations / 原子サイズシリコン接点 / MCBJ |
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| Research Abstract |
This research has been planned on the basis of our previous studies of current induced breakdown of metal nanocontacts. The project goal is to deepen our understanding of that breakdown phenomenon and obtain some implications towards its application for fabricating nano-gapped electrodes. Our major achievements are listed below.
1 We have measured the break conductance of various metal nanocontacts and found a positive correlation between the critical current density for the breakdown and the melting temperature of metals. This result suggests that the current-induced breakdown of metal nanocontacts is presumably due to the contact melting.
2 We have succeeded in measuring the the conductance two-level fluctuations (TLFs) of atom-sized metal contacts by at low temperatures. From the bias dependence of the TLF frequency, we could estimate the effective contact temperature under high biases. At 77K, silver and zinc contacts start to overheat at 0.5V and 0.4V, respectively, while copper nd
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gold contacts show no sign of overheating up to 0.6V. However, at 4K, the effective temperature of gold atom-sized contact is found to increase with the bias. We showed that the theoretical model proposed by Todorov et at. well accounts for the observed bias dependence of the contact temperature.
3 By exploiting the ultra-high-vacuum break-junction technique, we could make and hold single-atom contacts of gold and copper, and measured their break voltage at room temperature by applying them a bias ramp. The break voltage exhibits a broad distribution and takes 1.1V and 0.7V, on the average, for gold and copper single-atom contacts, respectively. Higher break voltage of gold single-atom contacts indicates their superior stability under high biases, in consistent with our previous observations. We also found that our experimental results on gold-single-atom contacts are compatible with the thermal-activation model of the high-bias contact break.
4 We have yielded new experimental results on the current-induced disruption of multi-walled carbon nanotubes and. benzenedithiol molecules and clarified the conductance of silicon-silicon atom-sized contacts. Less
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Report
(4 results)
Research Products
(83 results)
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[Presentation] Conductance of atom-sized contacts of Si (II)2007
Author(s)
Tomoki, Iwanari, Toyo, Sakata, Yutaka, Miyatake, Shu, Kurokawa, Akira, Sakai
Organizer
The 54th Spring Meeting of the Japan Society of Applied Physics and Related Societies
Place of Presentation
Sagamihara
Year and Date
2007-03-27
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Presentation] Conductance of atom-sized Si contacts2007
Author(s)
Tomoki, Iwanari, Toyo, Sakata, Yutaka, Miyatake, Shu, Kurokawa, Akira, Sakai
Organizer
2007 Spring Meeting of the Physical Society of Japan
Place of Presentation
Kagoshima
Year and Date
2007-03-20
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Presentation] Conductance of individual 1,4-benzenedithiol molecules2006
Author(s)
Yumi, Teramae, Kazunori, Horiguchi, Makusu, Tsutsui, Shu, Kurokawa, Akira, Sakai
Organizer
Nonoscience at surfaces ISSP-10
Place of Presentation
Kashiwa
Year and Date
2006-10-12
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Conductance of Atom-sized Zn Contacts2006
Author(s)
Ryo, Suzuki, Yasuhiro, Mukai, Makusu, Tsutsui, Shu, Kurokawa, Akira, Sakai
Organizer
61st Annual Meeting of the Physical Society of Japan
Place of Presentation
Matsuyama
Year and Date
2006-03-30
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Au 1G_0接点の寿命分布2005
Author(s)
酒井 明
Organizer
日本物理学会2005年秋季大会
Place of Presentation
京田辺市
Year and Date
2005-09-20
Description
「研究成果報告書概要(和文)」より
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