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Measurement of Inductance in Niobium Nitride Films for Single Flux Quantum Circuits
- Source :
- IEEE Transactions on Applied Superconductivity. 30:1-5
- Publication Year :
- 2020
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2020.
-
Abstract
- In recent years, rapid single flux quantum (RSFQ) circuits, which are promising for the development of high-speed digital electronics, have attracted widespread interest. Niobium nitride (NbN) films have also attracted significant attention for high-frequency applications in superconducting electronics because of their superior material parameters, including their high critical temperature T c and large gap voltage V g. To enable the development of all-NbN SFQ circuits, we have developed a fabrication process based on NbN junctions and inductors made of NbN strip lines. It is important to evaluate the inductance because it can affect the performance of an RSFQ circuit and is essential for the RSFQ design. We measured the inductance properties of both epitaxial and polycrystalline NbN strip lines using a superconducting quantum interference device modulation technique at 4.2 K and obtained the width dependence on the inductance of the NbN films. The penetration depth was then calculated from these measurements. The NbN inductance values were calculated numerically with respect to the penetration depth and were then compared with the measured values from the experiments. It was demonstrated that the differences between these values were within 5%. The results reported here will be useful for the design and fabrication of all-NbN RSFQ circuits.
- Subjects :
- Josephson effect
Niobium nitride
Materials science
business.industry
Condensed Matter Physics
Inductor
01 natural sciences
Electronic, Optical and Magnetic Materials
Inductance
chemistry.chemical_compound
chemistry
Rapid single flux quantum
Magnetic flux quantum
0103 physical sciences
Optoelectronics
Electrical and Electronic Engineering
010306 general physics
Penetration depth
business
Electronic circuit
Subjects
Details
- ISSN :
- 23787074 and 10518223
- Volume :
- 30
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Applied Superconductivity
- Accession number :
- edsair.doi...........2ef2f59a3f33fcf811498626e21ceb4a
- Full Text :
- https://doi.org/10.1109/tasc.2020.3016983