Abstract
AbstractAll‐NbN nanobridges were developed for the thin‐film Josephson mixer in an integrated receiver for the detection of electromagnetic radiation. The transport mechanism of dc current and the product of the critical current‐normal state resistance were evaluated. As a result, it was found that when the thickness of an NbN film at the bridge section was (5 ∼ 7) ζ, bulk‐like non‐Josephson currents, which make the mixer design and operation analysis difficult, were superimposed on the critical current. The value of the non‐Josephson current was evaluted quantitatively by measuring the magnetic field dependence of the critical current. The non‐Josephson current due to the three‐dimensional effect of the current flowing through the bridge section was removed by Ar‐ion thinning of the NbN film at the bridge section. The IJRN product was evaluated by using the true Josephson current IJ.
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