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Paper Abstract and Keywords
Presentation 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
Abstract (in Japanese) (See Japanese page) 
(in English) 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.
Keyword (in Japanese) (See Japanese page) 
(in English) Ferromagnetic Josephson junction / SQUIDs / Pi-junctions / / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 248, SCE2021-10, pp. 15-18, Nov. 2021.
Paper # SCE2021-10 
Date of Issue 2021-11-08 (SCE) 
ISSN Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SCE  
Conference Date 2021-11-15 - 2021-11-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SCE 
Conference Code 2021-11-SCE 
Language English 
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.)
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Speaker Author-1 
Date Time 2021-11-15 16:30:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2021-10 
Volume (vol) vol.121 
Number (no) no.248 
Page pp.15-18 
Date of Issue 2021-11-08 (SCE) 

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