Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
Abstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the freque...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2017-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-017-08710-7 |
| _version_ | 1818343982067875840 |
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| author | R. N. Jabdaraghi D. S. Golubev J. P. Pekola J. T. Peltonen |
| author_facet | R. N. Jabdaraghi D. S. Golubev J. P. Pekola J. T. Peltonen |
| author_sort | R. N. Jabdaraghi |
| collection | DOAJ |
| description | Abstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation. |
| first_indexed | 2024-12-13T16:39:14Z |
| format | Article |
| id | doaj.art-4690751532e04c0fb6e343efce4c85ad |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-13T16:39:14Z |
| publishDate | 2017-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-4690751532e04c0fb6e343efce4c85ad2022-12-21T23:38:19ZengNature PortfolioScientific Reports2045-23222017-08-017111110.1038/s41598-017-08710-7Noise of a superconducting magnetic flux sensor based on a proximity Josephson junctionR. N. Jabdaraghi0D. S. Golubev1J. P. Pekola2J. T. Peltonen3Low Temperature Laboratory, Department of Applied Physics, Aalto University School of ScienceLow Temperature Laboratory, Department of Applied Physics, Aalto University School of ScienceLow Temperature Laboratory, Department of Applied Physics, Aalto University School of ScienceLow Temperature Laboratory, Department of Applied Physics, Aalto University School of ScienceAbstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation.https://doi.org/10.1038/s41598-017-08710-7 |
| spellingShingle | R. N. Jabdaraghi D. S. Golubev J. P. Pekola J. T. Peltonen Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction Scientific Reports |
| title | Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction |
| title_full | Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction |
| title_fullStr | Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction |
| title_full_unstemmed | Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction |
| title_short | Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction |
| title_sort | noise of a superconducting magnetic flux sensor based on a proximity josephson junction |
| url | https://doi.org/10.1038/s41598-017-08710-7 |
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