Abstract
In this study, the critical factors affecting the sensitivity of a magnetic field sensor, based on linear DC field dependence of second harmonic signals generated by co-application of AC and DC fields to polycrystalline type II superconductors, were handled. For this purpose, the Y-123 superconducting samples with different amounts of cobalt ion, as a core material, were synthesized in order to get the best sensing performance. From the M–T and M–H measurements, we have tried to understand the relation between the 2f signal strength (used as the sensor signal) and the characteristic magnetic properties of these superconductors, such as the Tc (on), the Tc (off), and the Hc1g. Finally, we could achieve to sense 0.5 μOe DC fields by using the Y-123 sample doped with 0.06 wt% of cobalt.
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