Abstract
We report results about an optimized three-dimensional nanoSQUID based on niobium tunnel nanojunctions having the loop suspended to reduce the parasitic capacitance. The SQUID loop has a size of 400 × 600 nm 2 while the dimension of the square tunnel nanojunctions is 150 × 150 nm 2 with a density of the critical current of about 35 × 10 3 A/cm 2 . The nanodevice has been characterized at liquid helium temperature; it has shown nonhysteretic current-voltage characteristics and smooth voltage- magnetic flux characteristics resulting in a very stable operation in a wide range of bias points. The spectral density of the magnetic flux noise in the white region, measured with a two-stage noise measurement setup, was as low as 300 nΦ 0 /Hz 1/2 corresponding to a spin sensitivity of few Bohr magnetons for bandwidth unit.
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