Characterization of dual high transition temperature superconducting quantum interference device first-order planar gradiometers on a chip

Kuen Lin Chen, Hong Chang Yang, P. C. Ko, H. E. Horng

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The dual first-order planar gradiometers of high transition temperature (high- Tc) superconducting quantum interference devices (SQUIDs) were designed and fabricated on a 10×10 mm2 SrTiO3 bicrystal substrate. Each gradiometer consists of four bare SQUIDs which are connected to two symmetric pickup loops. Any two of the SQUIDs can be connected in series to obtain better performance. In this study, by selecting the coupling direction of SQUID, a balance resolution of 0.08% was achieved. And, a second-order electronic planar gradiometer was composed of these two first-order gradiometers. Experimental data showed that the noise performance of the second-order electronic planar gradiometer composed of two planar first-order gradiometers can reach 15 μ 0 / Hz1/2 at 1 kHz in an unshielded environment, which is comparable to the noise level of a magnetometer in a shielded environment.

Original languageEnglish
Article number064503
JournalJournal of Applied Physics
Issue number6
Publication statusPublished - 2010 Sep 15


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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