Grooved Dayem nanobridges as building blocks of high-performance YBa${}_2$Cu${}_3$O${}_{7-\delta }$ SQUID magnetometers

Abstract

We present noise measurements performed on a YBa${}_2$Cu${}_3$O${}_{7-\delta }$ nanoscale weak-link-based magnetometer consisting of a Superconducting QUantum Interference Device (SQUID) galvanically coupled to a $3.5\times 3.5$mm${}^2$ pick-up loop, reaching white flux noise levels and magnetic noise levels as low as $6\mu {\Phi }_0/\sqrt{\mathrm{Hz}}$ and $100$~fT/$\sqrt{\mathrm{Hz}}$ at $T=77$~K, respectively. The low noise is achieved by introducing Grooved Dayem Bridges (GDBs), a new concept of weak-link. A fabrication technique has been developed for the realization of nanoscale grooved bridges, which substitutes standard Dayem bridge weak links. The introduction of these novel key blocks reduces the parasitic inductance of the weak links and increases the differential resistance of the SQUIDs. This greatly improves the device performance, thus resulting in a reduction of the white noise.

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Cited by in corpus (9)

• Superconducting Quantum Interference in Twisted van der Waals Heterostructures
• Properties of Grooved Dayem Bridge based YBa${}_2$Cu${}_3$O${}_{7-\delta }$ Superconducting Quantum Interference Devices and Magnetometers
• Fabrication and electrical transport characterization of high quality underdoped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ nanowires
• Miniaturization of the Superconducting Memory Cell via a Three-Dimensional Nb Nano-Superconducting Quantum Interference Device
• SQUID magnetometer based on Grooved Dayem nanobridges and a flux transformer
• The role of kinetic inductance on the performance of YBCO SQUID magnetometers
• Mapping the phase diagram of a YBa${}_2$Cu${}_3$O${}_{7-\delta }$ nanowire through electromigration
• Geometric Scaling of the Current-Phase Relation of Niobium Nano-Bridge Junctions
• Observation of the Josephson effect in superhydrides: DC SQUID based on (La,Ce)H${}_{10+x}$ with operating temperature of 179 K