Giant Inductance Device based on Ferromagnetic pi Josephson Junctions for Increasing the Integration of Superconductor Digital Circuits
| Project/Area Number |
23K13376
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 21060:Electron device and electronic equipment-related
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| Research Institution | Nagoya University |
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Principal Investigator |
李 峰 名古屋大学, 工学研究科, 特任助教 (00888381)
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| Project Period (FY) |
2023-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2024: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2023: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | Josephson junction / π-JJ / giant inductance / negative inductance / SFQ circuit / SQUID / 負性インダクタンス / 巨大インダクタンス / SFQ回路 |
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| Outline of Research at the Start |
本研究では、磁性ジョセフソン接合による負性インダクタンス素子を実現し、これを超伝導線と並列接続することで超伝導巨大インダクタンス素子（π-SQUID）を実現したことである。π-SQUIDの実効インダクタンスは、幾何学的インダクタンスのみの場合よりも数十倍倍以上であり、π-SQUIDの設計方法論を確定し、デバイスの製造プロセスを最適化し、共振測定によってデバイスの有効インダクタンスを検出し、それを超伝導デジタル回路の統合度向上に応用することです。
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| Outline of Annual Research Achievements |
The negative inductance of ferromagnetic Josephson junction (π-JJ) has been confirmed with a negative circulating current in the superconducting quantum interference device composed of π-JJ and superconducting loop. The effect of the screening parameter βL on the design of the superconducting giant inductance device was verified in experiment. To meet the requirement of the screening parameter, superconductor/ferromagnet/insulator/superconductor (SFIS)π-JJ has been adopted to design the giant inductance device. Single flux quantum (SFQ) Ring-oscillator with giant inductance devices has been designed and fabricated, however, the effective inductance has not been extracted at present.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The design methodology of the superconducting giant inductance device has been established and the device or circuit fabrication process has also been developed.
The next step is to optimize the fabrication process to make sure the fabricated device or circuits meet the reqirement and test the effective inductance as planed.
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| Strategy for Future Research Activity |
1.Mainly focuse on the developement of giant inductance device on superconductor/ferromagnet/insulator/superconductor (SFIS)π-JJ.
2.Optimizing the fabrication of SFIS JJ further to obtain a much more stable critical current density.
3.To design SFQ circuits with different giant inductance devices to mitigate the influence of the parameters deviation on the effectiveness of the giant inductance device.
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Report
(1 results)
Research Products
(7 results)
