Abstract
We analyse here the sensing performance of a magnetometer which is based on the linear dc-field dependence of the second harmonic signal generated by high-Tc polycrystalline superconductors. Experiments realized in a series of polycrystalline REBa2Cu3O7−δ (RE = Y, Sm and Nd) superconductors have shown that some parameters (e.g. Hc1J and H*) peculiar to the studied superconductors change depending on the RE ions, and those determine the sensitivity limit of the magnetometer. The lowest measurable magnetic fields are 0.1, 5 and 38 nT for RE = Sm, Y and Nd, respectively at the functioning temperature of 77 K. With an upper limit above the Earth's field the magnetometer has attracted the attention of manufacturers in the industry.
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