K Peiselt et al 2003 Supercond. Sci. Technol. 16 1408 doi:10.1088/0953-2048/16/12/019
K Peiselt1, F Schmidl1, S Linzen1, A S Anton1, U Hübner2 and P Seidel1
Show affiliationsWe describe a new design of a gradiometric flip-chip antenna, which is inductively coupled to a dc-SQUID gradiometer. Both components are patterned out of thin films of the high-Tc superconductor YBa2Cu3O7−x (YBCO). For the flip-chip antenna, a 40 mm × 10 mm SrTiO3 single crystalline substrate is used, while the gradiometer sensors are prepared on 10 mm × 10 mm SrTiO3 bicrystal substrates. Special attention is paid to the inductive coupling between the flip-chip antenna and the read-out gradiometer antenna. We investigate different designs of coupling loops in order to optimize the coupling inductance between both components of the sensor. With optimized coupling the sensor achieves a field-gradient resolution of 12 fT cm−1 Hz−1/2 in the white noise region and of 310 fT cm−1 Hz−1/2 at 1 Hz in the unshielded laboratory environment.
85.25.Dq Superconducting quantum interference devices (SQUIDs)
85.25.Am Superconducting device characterization, design, and modeling
Issue 12 (December 2003)
Received 17 July 2003, in final form 2 September 2003
Published 5 November 2003
K Peiselt et al 2003 Supercond. Sci. Technol. 16 1408
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