Monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers

Author

Hilgenkamp, J.W.M. ; Brons, G.C.S. ; Hoogeveen, S. ; Flokstra, J. ; Rogalla, H.

Author_Institution

Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2338

Lastpage

2341

Abstract

YBa/sub 2/Cu/sub 3/O/sub 7-x/ based monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers operating up to 73 K have been realized. The devices are characterized by high values of the modulation voltage, up to 32 /spl mu/V at 40 K. A minimal white noise level of 0.10 pT//spl radic/Hz was obtained above 200 Hz, and 0.64 pT//spl radic/Hz at 1 Hz and 55 K. The temperature dependence of the modulation voltage, the effective sensing area and the field sensitivity are discussed. Model-calculations have been performed to investigate high frequency resonances in the washer-input coil structure. Methods for damping are considered.<>

Keywords

SQUID magnetometers; barium compounds; high-temperature superconductors; modulation; resonance; superconducting device noise; white noise; yttrium compounds; 40 to 73 K; DC SQUID magnetometers; HTS device; HTSC magnetometer; YBa/sub 2/Cu/sub 3/O/sub 7/; damping methods; effective sensing area; field sensitivity; high frequency resonances; high-T/sub c/ magnetometers; model calculations; modulation voltage; monolithic flux transformer-coupled magnetometer; temperature dependence; washer-input coil structure; white noise level; Coils; Couplings; Damping; Electric variables; Fabrication; Grain boundaries; Resonant frequency; SQUID magnetometers; Temperature dependence; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403054

Filename

403054