HTS dc SQUID behavior in external magnetic fields

Author

Schultze, V. ; Oukhanski, N. ; Zakosarenko, V. ; Ijsselsteijn, R. ; Ramos, J. ; Chwala, A. ; Meyer, H.-G.

Author_Institution

Inst. for Phys. High Technol., Jena, Germany

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1319

Lastpage

1322

Abstract

Several types of HTS dc SQUID magnetometers - directly coupled magnetometers with either a conventionally solid pickup loop or with 17 narrow loops in parallel and flip-chip magnetometers-are tested concerning their behavior in external fields. The stability against flux penetration was measured by the determination of the magnetic hysteresis. This stability is increased by steep structure edges in the SQUID and in the pickup loop. The intrinsic noise of SQUIDs during operation in external fields was determined by simultaneous measurement of the spectra of two SQUIDs. A directly coupled magnetometer with narrow parallel loops showed much smaller intrinsic noise after movement in the Earth´s magnetic field than one with a solid pickup loop

Keywords

SQUID magnetometers; flip-chip devices; high-temperature superconductors; magnetic hysteresis; superconducting device noise; Earth magnetic field; HTS DC SQUID magnetometer; directly coupled magnetometer; flip-chip magnetometer; flux noise; flux penetration; magnetic field; magnetic hysteresis; parallel loops; solid pickup loop; stability; Couplings; High temperature superconductors; Magnetic field measurement; Magnetic fields; Magnetic hysteresis; Magnetic noise; SQUID magnetometers; Solids; Stability; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919593

Filename

919593