Study on the Force and Potential for the Vortex Motion Around the Concave Film Edge by the Numerical Calculation

Inoue, M.; Mizoguchi, Shota; Fujimaki, Akira

doi:10.1109/tasc.2016.2636249

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…Material suitable for the superconducting ground plane has been investigated to efficiently trap the flux quantum in the moat [20]. How the moat attracts the magnetic flux has been theoretically and numerically analyzed [21], [22]. In previous studies, the influence of the flux quanta trapped in moats on superconducting circuit operation have been ignored.…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation

Yamanashi

Imai

Yoshikawa

2018

IEEE Trans. Appl. Supercond.

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The influence of a trapped flux quantum in a superconducting ground plane hole, called a moat, on superconducting circuit operation was analyzed. We devised a calculation model to estimate the magnetic flux threading a signal line of a superconducting integrated circuit by the trapped flux quantum in a moat placed near the signal line by using a conventional inductance extraction tool. Assuming one flux quantum trapped in the moat, the dependence of the magnetic flux threading the signal line on the distance between the moat and the signal line were calculated. We measured the flux linkage by measuring the modulation of the I-V characteristic of a dc-SQUID with a moat near the SQUID implemented by using the 2.5 kA/cm 2 Nb standard process. The measured flux linkage agrees well with the analysis results using the devised calculation model. When the distance between the 1 µm × 10 µm moat and the SQUID, the signal line size of which corresponds to the typical inductance of an adiabatic flux quantum parametron (AQFP), is 1 µm and one flux quantum is trapped in the moat, the measured magnetic flux linkage threads the signal line was approximately 1.2% of the flux quantum. This flux linkage induces approximately 4% deterioration of the device margin of the AQFP. The devised calculation model and experimental results provide useful information for designing highly integrated future superconducting integrated circuits.

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Section: Introductionmentioning

confidence: 99%

Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation

Yamanashi

Imai

Yoshikawa

2018

IEEE Trans. Appl. Supercond.

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“…In addition, trapped vortices were suspected to account for either the reduction of the critical current of the Josephson junction [10][11][12] or the disturbance of logical operations of the flux quanta in the superconducting circuit [12]. However, their distribution is affected by various driving forces created by bias currents, heat, and magnetic fields [13,14].…”

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confidence: 99%

Influence of surrounding vortices on critical current of a Nb/Al-AlO _x /Nb Josephson junction

Pan

Zhang

Yang

et al. 2023

Supercond. Sci. Technol.

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Resistively shunted Nb/Al–AlOx/Nb Josephson junctions have been widely used in large-scale superconducting electronics such as the single-flux quantum circuit. The critical current determines substantially the working margin of the circuit. The distribution of vortices in the niobium film around superconducting devices is also commonly suspected to degrade the performance of devices. Unfortunately, most studies on Nb/Al–AlOx/Nb Josephson junctions only present electric transport measurements. Using a magnetic force microscope, we observed the static distribution of the vortices around the junction after sweeping the current–voltage curves of the junction in-situ. The measurements showed that the distribution density of vortices affected the critical current of the junction. Furthermore, we observed an aggregation of vortices arising from the Joule heat generated by the shunt resistor. It caused an irreversible decrease in the junction’s critical current.

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Overview of superconducting wireless power transfer

Lyu,

Liu,

et al. 2024

Energy Reports

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Study on the Force and Potential for the Vortex Motion Around the Concave Film Edge by the Numerical Calculation

Cited by 6 publications

References 23 publications

Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation

Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation

Influence of surrounding vortices on critical current of a Nb/Al-AlO _x /Nb Josephson junction

Overview of superconducting wireless power transfer

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Study on the Force and Potential for the Vortex Motion Around the Concave Film Edge by the Numerical Calculation

Cited by 6 publications

References 23 publications

Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation

Influence of Magnetic Flux Trapped in Moats on Superconducting Integrated Circuit Operation

Influence of surrounding vortices on critical current of a Nb/Al-AlO x /Nb Josephson junction

Overview of superconducting wireless power transfer

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Product

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Influence of surrounding vortices on critical current of a Nb/Al-AlO _x /Nb Josephson junction