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Magnetometer Design for Measuring Ultralow DC Magnetic Fields Using YBa2Cu3O7−x Superconductors

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Abstract

In the present work we examined a special sensor design using a YBa2Cu3O7−x superconductor as a sensing element for the detection of ultralow DC magnetic fields. The experimental results have shown that the sensor signal, which is the second harmonic signal generated by co-application of AC and DC fields to high-T c superconductors, varies linearly with the applied DC field even in the −0.5 Oe to 0.5 Oe range. The critical factors affecting the strength of the second harmonic signal, such as the frequency and amplitude of the AC field, the intergrain critical field H c1J , and the minimum field required for penetration through the entire specimen H ∗, were optimized. In this way we could detect DC magnetic fields as low as 1 nT.

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Acknowledgements

This work was supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK), grant no. 109T715.

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Authors and Affiliations

  1. TÜBİTAK-UME (National Metrology Institute), P.K. 54, 41470, Gebze, Kocaeli, Turkey

    Fatma Alıkma & Ugur Topal

  2. Physics Department, Marmara University, Istanbul, Turkey

    Fatma Alıkma

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  1. Fatma Alıkma
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  2. Ugur Topal
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Correspondence to Ugur Topal.

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Alıkma, F., Topal, U. Magnetometer Design for Measuring Ultralow DC Magnetic Fields Using YBa2Cu3O7−x Superconductors. J Supercond Nov Magn 26, 1155–1158 (2013). https://doi.org/10.1007/s10948-012-1901-x

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  • DOI: https://doi.org/10.1007/s10948-012-1901-x

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