Abstract
A micrometre-size Josephson vortex flow transistor is demonstrated experimentally. Thedrain–source of this device is the output of a single-layer Nb superconducting quantuminterference device (SQUID) with a nanometre-size hole, forming a nanoSQUID. The deviceinput is a Nb strip, which is closely coupled to the nanoSQUID. The change of the inputcurrent induces a change in the magnetic flux coupling to the nanoSQUID, and hencemodulates the current–voltage characteristics of the nanoSQUID. The current gain andtransresistance of the device were investigated by evaluating the mutual coupling and thedynamic resistance of the nanoSQUID. A current gain of 0.3 and a transresistance>1 Ω were achieved.
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