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TT: Tiefe Temperaturen

TT 10: SQUID Anwendungen

TT 10.2: Talk

Tuesday, March 27, 2001, 11:30–11:45, H

Sensitive HTS dc-SQUID Flip-Chip Magnetometers and Gradiometers — •M. I. Faley¹, U. Poppe¹, K. Urban¹, D. N. Paulson², T. N. Starr², and R. L. Fagaly² — ¹Institut fuer Festkoerperforschung, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany — ²Tristan Technologies, Inc., San Diego, CA 92121 U.S.A.

We have fabricated HTS dc-SQUID flip-chip sensors with multilayer flux transformers. For the magnetometers a resolution of about 6 fT/rt(Hz) and the planar gradiometers a resolution of about 30 fT/cm x rt(Hz) were routinely obtained at 77 K. The noise was nearly white down to frequencies of few Hz. The sensors were vacuum-tight encapsulated together with a heater and a feedback coil. This makes the handling of the sensors more reproducible and convenient. Production of the magnetometers and gradiometers in small series was proven.