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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