Geometry-induced sensitivity enhancement in unconventional nano-SQUID architectures

Abstract

Superconducting Quantum Interference Devices (SQUIDs) represent a cornerstone of nanoscale metrology, offering unparalleled magnetic field sensitivity across diverse scientific and technological frontiers. Since device performance is intrinsically linked to loop geometry and architecture, we employ the Ginzburg–Landau formalism to investigate the electrodynamics of an unconventional nano-SQUID integrated with a pickup loop. This study rigorously evaluates the impact of geometric scaling, focusing on the effects of minimized loop dimensions and track widths on flux noise and sensitivity. Our findings demonstrate that optimizing the device’s tilt angle and spatial configuration significantly enhances magnetic coupling and detection limits. These results provide a theoretical framework for engineering next-generation nano-SQUIDs with superior resolution for localized magnetic sensing.