Abstract
For the fabrication of nanoscale SQUIDs, for example having loop diameters of order1 µm or smaller, the conventional trilayer window-type Josephson junctions are too large.Instead, we consider the use of nanobridge junctions with dimensions of order 100 nm.The problem of hysteresis in the junctions’ current–voltage characteristic (IVC)is avoided by depositing a gold overlayer, which serves as both a thermal andelectrical shunt. Noise measurement of dc SQUIDs which incorporate such Nbnanobridges as the Josephson junctions are reported. Devices having differentIVCs were fabricated and characterized. The best device has a flux noise of5 × 10−6 Φ0 Hz−1/2 at 4.2 K, and there is no significant increase in the noise level in a static magnetic field upto 2 mT. Techniques for increasing the voltage modulation depth, and hence improving theflux noise performance, are discussed.
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