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

doi:https://doi.org/10.1063/1.117324

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

Full Record
Other Related Research

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:

Fuke, H; Saitoh, K; Utagawa, T; Enomoto, Y ^[1]

Superconductivity Research Laboratory-ISTEC, Shinonome 1-10-13, Koto-ku, Tokyo 135 (Japan)

Publication Date:: 1996-11-01

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.

Copy to clipboard


                    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

Copy to clipboard


                    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.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1063/1.117324

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

High speed non-latching squid binary ripple counter

Conference Silver, A H ; Phillips, R R ; Sandell, R D - IEEE Trans. Magn.; (United States)

High speed, single flux quantum (SFQ) binary scalers are important components in superconducting analog-to-digital converters (ADC). This paper reviews the concept for a SQUID ADC and the design of an SFQ binary ripple counter, and reports the simulation of key components, and fabrication and performance of non-latching SQUID scalers and SFQ binary ripple counters. The SQUIDs were fabricated with Nb/Nb/sub 2/O/sub 5//PbIn junctions and interconnected by monolithic superconducting transmission lines and isolation resistors. Each SQUID functioned as a bistable flip-flop with the input connected to the center of the device and the output across one junction. All junctions were criticallymore »« less
Dc SQUID magnetometers from single layers of YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]]

Journal Article Koelle, D ; Miklich, A H ; Ludwig, F ; ... - Applied Physics Letters; (United States)

We have fabricated magnetometers patterned in a single layer of YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]] involving dc superconducting quantum interference devices (SQUIDs) with bicrystalline grain boundary junctions. The magnetometers consist of either a SQUID with a large area square washer or a single turn pickup loop coupled directly to the body of a small area SQUID. We found that the transfer function falls off with increasing SQUID inductance much more rapidly than predicted; implications for magnetometer performance are discussed. When operated at 77 K with a bias reversal technique a directly coupled magnetometer had a noise of (105[plus minus]10) fTmore »« less
https://doi.org/10.1063/1.110526
Low 1/ f noise single-layer YBa sub 2 Cu sub 3 O sub x dc SQUID at 77 K

Journal Article Friedl, G ; Vildic, M ; Roas, B ; ... - Applied Physics Letters; (United States)

Autonomous single-layer dc superconducting quantum interference devices (SQUIDs) have been prepared from epitaxial, laser-deposited YBa{sub 2}Cu{sub 3}O{sub {ital x}} films on step edge SrTiO{sub 3} and LaAlO{sub 3} substrates. For device patterning, a SiO{sub {ital x}} inhibit technique as well as conventional ethylenediaminetetraacetic wet etch was used. The Josephson junctions are of grain boundary type. Their widths are 5 {mu}m. The SQUID hole is a square of about 5 {mu}m; the SQUID inductance is estimated to be about 20 pH. We obtained a very regular, nonhysteretic flux to voltage modulation over more than 100 flux quanta ({Phi}{sub 0}). The maximummore »« less
https://doi.org/10.1063/1.106752
Principles and applications of SQUIDs

Journal Article Clarke, J - Proceedings of the IEEE (Institute of Electrical and Electronics Engineers); (USA)

Superconducting quantum interference devices (SQUIDs) combine flux quantization and Josephson tunneling to produce an output voltage that is periodic in the applied magnetic flux with a period of one flux quantum Phi/sub o/. SQUIDs are thus flux-to-voltage transducers, and are able to detect changes in flux much smaller that Phi/sub o/. Using Nb-based thin-film technology, a number of groups can now routinely fabricate dc SQUIDs with input circuits integrated on the same chip. At 4.2 {Kappa} the dc SQUID, which operates with a constant bias current, can detect signals with an equivalent energy per unit bandwidth of a few hundredmore »« less
https://doi.org/10.1109/5.34120
Second generation dc SQUID sensors: ROS with frequency readout and DROS with voltage readout

Book Adelerhof, D J ; Duuren, M van ; Flokstra, J ; ...

Relaxation Oscillation SQUIDs (ROSs) based on 4x4 {mu}m{sup 2} Nb/AlO{sub x} Josephson tunnel junctions have been fabricated and characterized. A ROS consists of a hysteretic dc SQUIID shunted by an inductor L and a resistor R in series to induce the relaxation oscillations. The values of L range from 20 nH up to about 300 nH, whereas the time constant L/R are between 8 and 45 ns. Frequency-flux characteristics have been recorded with the help of a spectrum analyzer, directly connected to the ROS. The relaxation frequencies range from 5 to 180 MHz. The experimental characteristics can be explained verymore »« less

Similar Records