High-frequency analysis of superconducting device by using microwave equivalent circuit
| Project/Area Number |
25420347
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | Kanagawa University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
ABE Susumu 神奈川大学, 工学部, 准教授 (10333147)
ANADA Tetsuo 神奈川大学, 工学部, 教授 (20260987)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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| Keywords | 超伝導 / トンネル素子 / ジョセフソン接合 / マイクロ波回路 / 磁界変調特性 / ジョセフソン素子 / マイクロ波 / 共振ステップ / 平面回路 / 超伝導デバイス / トンネル接合 / マイクロ波照射 / マイクロ波等価回路 / 磁界変調 / アルミニウム酸化膜 / シャピロステップ |
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| Outline of Final Research Achievements |
By using niobium (Nb) superconducting material and aluminum (Al) metal, we have fabricated Nb/Al-oxide/Nb Josephson tunnel junctions. Though Nb/Al-oxide/Nb superconducting junctions a current can flow without voltage drop at liquid helium temperature (4.2K), where the critical current value can be modulated by an external magnetic field. In the current-voltage characteristics of this superconducting junction, both the superconducting current and the resonant current steps at a finite voltage can be observed. The microwave would propagate perpendicular direction to an external magnetic field inside the junction tunnel-oxide region. The microwave frequency is proportional to the voltage value (50GHz---0.1mV). We can explain these phenomena using our new plain microwave circuit model.
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Report
(4 results)
Research Products
(6 results)
