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Several different critical current density (7c:30A/cm2∼4000A/cm2) of Nb/Al-AlOx/Nb Josephson junctions were fabricated by standard selective niobium etch process (SNEP) for application of dc SQUID magnetometers. The subgap leakage factor Vm of most junctions is larger than 30 mV. Based on the good tunneling properties of junctions, we designed and fabricated a dc SQUID with loop inductance of 140...
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