Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 20: Supraleitung: Dünne Schichten, Josephsonkontakte, SQUIDs II

TT 20.3: Talk

Thursday, March 14, 2002, 14:45–15:00, H18

Long Baseline Planar Hardware Gradiometer with HTS rf-SQUIDs — •Grigory Panaitov, Yi Zhang, Hans-Joachim Krause, Jurgen Schubert und Marko Banzet — Forschungszentrum Juelich GmbH, 52425 Juelich

Superconducting Quntum Interference Devices (SQUIDs) are known as the most sensitive instruments to measure weak magnetic signals. In order to compensate the large environmental noise, a wire-wound gradiometric pick-up coil coupled to the SQUID is spread used. Due to the lack of high-quality high temperature superconducting (HTS) wires, HTS SQUIDs are usually operated in the configuration of an electronic gradiometer. Recently, a hardware planar gradiometer with a dc-SQUID and an asymmetric planar flux transformer was demonstrated by Dantsker et al. /APL, 71, 1712 (1997)/. We developed an asymmetric thin film gradiometer based on an HTS rf-SQUID. Advantage of the technique is that gradiometers with very long baseline can be realised. The performance of a 13mm baseline rf-SQUID gradiometer will be presented. We will discuss also the possibilities to optimise the gradiometer design and the development of longer baseline devices. This work was partially supported by BMBF Project No. 13N7739.