Hamburg 2001 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 10: SQUID Anwendungen
TT 10.2: Vortrag
Dienstag, 27. März 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.