2023 Fiscal Year Research-status Report
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 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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| Keywords | Josephson junction / π-JJ / giant inductance / negative inductance / SFQ circuit |
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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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| Causes of Carryover |
1. Liquid Helium and photomasks are required to carry out the related experiment;
2. The traveling fee is needed to report the achievements during international and dometic conferences;
3. Some money will be used to cover the fee related to paper publication;
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