A SQUID gradiometer with trimmable additional positive feedback

Youichi Takada, Keiji Tsukada, Akira Adachi

Research output: Contribution to journalArticle

Abstract

A SQUID gradiometer with a glass package and trimmable additional positive feedback (APF) is developed to achieve a low equivalent flux noise over a wide range of bias current. The noise characteristics of a SQUID with APF are investigated by varying the APF gain and the bias current. We found the most suitable APF parameter to achieve low equivalent flux noise over a wide range of bias current. When a SQUID with APF has a co-planar first-order coil whose effective area is 100 mm2, a typical gradiometer noise level of 7.4 fT Hz-1/2 at 100 Hz and 21 fT Hz-1/2 at 1 Hz is achieved.

Original languageEnglish
Pages (from-to)A120-A123
JournalSuperconductor Science and Technology
Volume9
Issue number4A
DOIs
Publication statusPublished - Jan 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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