Journal article
Low-Noise Diamond-Based D.C. Nano-SQUIDs
M Bose, DL Creedon, A Barlow, M Stuiber, GM Klemencic, S Mandal, O Williams, G van Riessen, CI Pakes
ACS Applied Electronic Materials | Published : 2022
Abstract
Nanoscale superconducting quantum interference devices (nano-SQUIDs) with Dayem bridge junctions and a physical loop size of 50 nm have been engineered in boron-doped nanocrystalline diamond films using precision Ne-ion beam milling. In an unshunted device, the nonhysteretic operation can be maintained in an applied field exceeding 0.1 T with a high flux-to-voltage transfer function, giving a low flux noise ϕnoise = 0.14μϕ0/Hz at 1 kHz and a concurrent spin sensitivity of 1 spins/Hz. At elevated magnetic fields, up to 2 T, flux modulation of the nano-SQUID output voltage is maintained but with an increase in period, attributed to an additional phase bias induced on the nano-SQUID loop by up ..
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Awarded by University of Melbourne
Funding Acknowledgements
This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) and the Materials Characterization and Fabrication Platform (MCFP) at the University of Melbourne (UoM), both in the Victorian Node of the Australian National Fabrication Facility (ANFF). D.L.C. is supported by Australian Research Council Discovery Project grant no. DP190102852. M.B. would like to thank Stephen Gregory and Scott Williams (UoM) for their help with wire bonding the devices.