Low noise YBa2Cu3O7−x–SrTiO3–YBa2Cu3O7−x multilayers for improved superconducting magnetometers

16 January 1995

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 66 (3) , 373-375
https://doi.org/10.1063/1.114217

Abstract

We have fabricated YBa₂Cu₃O_7−x–SrTiO₃–YBa₂Cu₃O_7−x (YBCO–STO–YBCO) trilayers, in which each layer is patterned photolithographically, capping the first YBCO film with an in situ STO film. Atomic force microscopy demonstrates that the capping process dramatically improves the quality of the surface of the second layer, allowing the growth of an upper YBCO film with a substantially reduced level of low‐frequency flux noise. A magnetometer with a multiturn flux transformer coupled to a dc superconducting quantum interference device achieved a magnetic field noise of 74 fT Hz^−1/2 at 1 Hz, improving to 31 fT Hz^−1/2 at 1 kHz.

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