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Paper Abstract and Keywords
Presentation 2026-01-13 14:10
Investigation of tunable flux transfer circuits with π-junctions
Kurato Toyama, Kai Nishizaki, Feng Li, Masamitsu Tanaka, Akira Fujimaki (Nagoya Univ.) SCE2025-13
Abstract (in Japanese) (See Japanese page) 
(in English) Flux transfer circuits (FTCs) transmit magnetic flux via mutual coupling in superconducting devices. We previously reported flux transfer circuits called π-FTCs, which utilize the negative inductance characteristic of π-junctions to achieve a higher transfer coefficient than conventional FTCs simply composed of inductance. The transmission coefficient of a π-FTC is determined by the current induced by quantum interference in a superconducting loop containing the π junction, and can be controlled by the critical current value and inductance. In this study, we have investigated couplers with a tunable transmission coefficient based on π-FTCs incorporating a DC-SQUID. Our circuit simulation has shown that the proposed π-FTCs can exhibit enhanced and flexible transfer coefficients over long distances, by modulating the critical current value of the DC-SQUID by applying an external magnetic field.
Keyword (in Japanese) (See Japanese page) 
(in English) Ferromagnetic Josephson junction / π junction / flux transfer circuits / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 314, SCE2025-13, pp. 11-14, Jan. 2026.
Paper # SCE2025-13 
Date of Issue 2026-01-06 (SCE) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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)
Download PDF SCE2025-13

Conference Information
Committee SCE  
Conference Date 2026-01-13 - 2026-01-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Superconducting Electronics 
Paper Information
Registration To SCE 
Conference Code 2026-01-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of tunable flux transfer circuits with π-junctions 
Sub Title (in English)  
Keyword(1) Ferromagnetic Josephson junction  
Keyword(2) π junction  
Keyword(3) flux transfer circuits  
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1st Author's Name Kurato Toyama  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
2nd Author's Name Kai Nishizaki  
2nd Author's Affiliation Nagoya University (Nagoya Univ.)
3rd Author's Name Feng Li  
3rd Author's Affiliation Nagoya University (Nagoya Univ.)
4th Author's Name Masamitsu Tanaka  
4th Author's Affiliation Nagoya University (Nagoya Univ.)
5th Author's Name Akira Fujimaki  
5th Author's Affiliation Nagoya University (Nagoya Univ.)
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Speaker Author-1 
Date Time 2026-01-13 14:10:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2025-13 
Volume (vol) vol.125 
Number (no) no.314 
Page pp.11-14 
#Pages 4 
Date of Issue 2026-01-06 (SCE) 

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