講演抄録/キーワード |
講演名 |
2021-11-15 16:30
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(Nagoya Univ.) SCE2021-10 エレソ技報アーカイブへのリンク:SCE2021-10 |
抄録 |
(和) |
We demonstrated the $B&P(B-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 $B&P(B-region with respect to PdNi thickness could be expected. We selected junctions with PdNi thickness in the expected $B&P(B-region and fabricated SFS-SQUIDs for measuring the magnetic field-dependent critical currents. A $B&P(B-phase shift has been observed in the modulation pattern of SFS-SQUID, which is evidence for the $B&P(B-state of the junction. |
(英) |
We demonstrated the $B&P(B-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 $B&P(B-region with respect to PdNi thickness could be expected. We selected junctions with PdNi thickness in the expected $B&P(B-region and fabricated SFS-SQUIDs for measuring the magnetic field-dependent critical currents. A $B&P(B-phase shift has been observed in the modulation pattern of SFS-SQUID, which is evidence for the $B&P(B-state of the junction. |
キーワード |
(和) |
Ferromagnetic Josephson junction / SQUIDs / Pi-junctions / / / / / |
(英) |
Ferromagnetic Josephson junction / SQUIDs / Pi-junctions / / / / / |
文献情報 |
信学技報, vol. 121, no. 248, SCE2021-10, pp. 15-18, 2021年11月. |
資料番号 |
SCE2021-10 |
発行日 |
2021-11-08 (SCE) |
ISSN |
Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
SCE2021-10 エレソ技報アーカイブへのリンク:SCE2021-10 |