| Presentation | 2021-11-15 Pi-phase shift in NbN-based Josephson junctions with weak ferromagnet Pd89Ni11 interlayer Duong Pham, Riku Sugimoto, Kenjiro Oba, Yuto Takeshita, Feng Li, Masamitsu Tanaka, Taro Yamashita, Akira Fujimaki, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We demonstrated the π-phase shift in NbN-based Josephson junction with a weak ferromagnetic Pd89Ni11 interlayer (NbN/PdNi/NbN junctions). The NbN/PdNi/NbN junctions with PdNi thicknesses of 10 - 40 nm were fabricated and studied. The junction show a clear overdamped current-voltage characteristic, which is typically for the SFS junction. We observed a non-monotonic dependence of critical currents on PdNi thicknesses, indicating the interplay of superconductivity and ferromagnetism. From the fitting an expression of the Usadel equation on the experimental data, the 0- and π-region with respect to PdNi thickness could be expected. We selected junctions with PdNi thickness in the expected π-region and fabricated SFS-SQUIDs for measuring the magnetic field-dependent critical currents. A π-phase shift has been observed in the modulation pattern of SFS-SQUID, which is evidence for the π-state of the junction. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Ferromagnetic Josephson junction / SQUIDs / Pi-junctions |
| Paper # | SCE2021-10 |
| Date of Issue | 2021-11-08 (SCE) |
| Conference Information | |
| Committee | SCE |
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| Conference Date | 2021/11/15(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Yoshio Mizugaki(Univ. of Electro-Comm.) |
| Vice Chair | |
| Secretary | (AIST) |
| Assistant | Hiroyuki Akaike(Daido Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Superconductive Electronics |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Pi-phase shift in NbN-based Josephson junctions with weak ferromagnet Pd89Ni11 interlayer |
| Sub Title (in English) | |
| Keyword(1) | Ferromagnetic Josephson junction |
| Keyword(2) | SQUIDs |
| Keyword(3) | Pi-junctions |
| 1st Author's Name | Duong Pham |
| 1st Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 2nd Author's Name | Riku Sugimoto |
| 2nd Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 3rd Author's Name | Kenjiro Oba |
| 3rd Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 4th Author's Name | Yuto Takeshita |
| 4th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 5th Author's Name | Feng Li |
| 5th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 6th Author's Name | Masamitsu Tanaka |
| 6th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 7th Author's Name | Taro Yamashita |
| 7th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| 8th Author's Name | Akira Fujimaki |
| 8th Author's Affiliation | Nagoya University(Nagoya Univ.) |
| Date | 2021-11-15 |
| Paper # | SCE2021-10 |
| Volume (vol) | vol.121 |
| Number (no) | SCE-248 |
| Page | pp.pp.15-18(SCE), |
| #Pages | 4 |
| Date of Issue | 2021-11-08 (SCE) |