Low-Noise Superconducting Quantum Interference Device with a High dV/dΦ Optimized by Thermally Controlling Critical Current

Keiji Tsukada, Jun Kawai, Youichi Takada, Akira Adachi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The transfer function dV/dΦ and the noise characteristics of a low-Tc superconducting quantum interference device (SQUID) have been improved by annealing to adjust the critical current, thereby optimizing the McCumber parameter βc- A SQUID structure suitable for annealing and using surface nitridation and planarization has also been developed. By annealing a SQUID that initially has a β c greater than 1, the I-V characteristics can be changed from characteristics with hysteresis to characteristics without hysteresis. A SQUID with = 0.81, close to the hysteresis limitation, had a large dV/dΦ (3.7 mV/Φ0) and good noise characteristics (1.5 μϕ0/√hz at 100 Hz and 3.0µΦ0/√Hz at 1 Hz). These characteristics can be attained even when using a simple measuring circuit connected directly to preamplifier without adaptive components such as flux modulation or additional positive feedback (APF).

Original languageEnglish
Pages (from-to)3488-3493
Number of pages6
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number3
DOIs
Publication statusPublished - 1995
Externally publishedYes

Fingerprint

Critical currents
SQUIDs
low noise
critical current
Hysteresis
interference
Annealing
hysteresis
annealing
Nitridation
Transfer functions
positive feedback
preamplifiers
Modulation
Fluxes
Feedback
transfer functions
Networks (circuits)
modulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Low-Noise Superconducting Quantum Interference Device with a High dV/dΦ Optimized by Thermally Controlling Critical Current. / Tsukada, Keiji; Kawai, Jun; Takada, Youichi; Adachi, Akira.

In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 3, 1995, p. 3488-3493.

Research output: Contribution to journalArticle

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