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Title: Fundamental operation of single-flux-quantum circuits using coplanar-type high-{ital T}{sub {ital c}} SQUIDs

Abstract

We have fabricated coplanar type dc SQUIDs using NdBa{sub 2}Cu{sub 3}O{sub {ital y}} superconducting thin films and operated fundamental single-flux-quantum (SFQ) circuits. The Josephson junctions were made by the narrow-focused ion beam irradiation technique. For a 145 {mu}m wide and 10 {mu}m long logic SQUID having a critical current of 105 {mu}A and an inductive parameter ({beta}{sub {ital L}}) of 28, a store and a restore of the flux quantum have been demonstrated at temperatures of 4.2{endash}30 K. These operations were performed with an input pulsewidth of 5 ns (5 ns was the shortest input pulse width available from our function generating equipment). These results show experimentally the possibility of high speed operation in all high-{ital T}{sub {ital c}} superconducting digital circuits. {copyright} {ital 1996 American Institute of Physics.}

Authors:
; ; ;  [1]
  1. Superconductivity Research Laboratory-ISTEC, Shinonome 1-10-13, Koto-ku, Tokyo 135 (Japan)
Publication Date:
OSTI Identifier:
388155
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 69; Journal Issue: 19; Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HIGH-TC SUPERCONDUCTORS; DIGITAL CIRCUITS; FLUX QUANTIZATION; SQUID DEVICES; JOSEPHSON JUNCTIONS; CRITICAL CURRENT; NEODYMIUM OXIDES; BARIUM OXIDES; COPPER OXIDES

Citation Formats

Fuke, H, Saitoh, K, Utagawa, T, and Enomoto, Y. Fundamental operation of single-flux-quantum circuits using coplanar-type high-{ital T}{sub {ital c}} SQUIDs. United States: N. p., 1996. Web. doi:10.1063/1.117324.
Fuke, H, Saitoh, K, Utagawa, T, & Enomoto, Y. Fundamental operation of single-flux-quantum circuits using coplanar-type high-{ital T}{sub {ital c}} SQUIDs. United States. https://doi.org/10.1063/1.117324
Fuke, H, Saitoh, K, Utagawa, T, and Enomoto, Y. Fri . "Fundamental operation of single-flux-quantum circuits using coplanar-type high-{ital T}{sub {ital c}} SQUIDs". United States. https://doi.org/10.1063/1.117324.
@article{osti_388155,
title = {Fundamental operation of single-flux-quantum circuits using coplanar-type high-{ital T}{sub {ital c}} SQUIDs},
author = {Fuke, H and Saitoh, K and Utagawa, T and Enomoto, Y},
abstractNote = {We have fabricated coplanar type dc SQUIDs using NdBa{sub 2}Cu{sub 3}O{sub {ital y}} superconducting thin films and operated fundamental single-flux-quantum (SFQ) circuits. The Josephson junctions were made by the narrow-focused ion beam irradiation technique. For a 145 {mu}m wide and 10 {mu}m long logic SQUID having a critical current of 105 {mu}A and an inductive parameter ({beta}{sub {ital L}}) of 28, a store and a restore of the flux quantum have been demonstrated at temperatures of 4.2{endash}30 K. These operations were performed with an input pulsewidth of 5 ns (5 ns was the shortest input pulse width available from our function generating equipment). These results show experimentally the possibility of high speed operation in all high-{ital T}{sub {ital c}} superconducting digital circuits. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.117324},
url = {https://www.osti.gov/biblio/388155}, journal = {Applied Physics Letters},
number = 19,
volume = 69,
place = {United States},
year = {1996},
month = {11}
}