Protecting SQUID metamaterials against stray magnetic field

Abstract

Using superconducting quantum interference devices (SQUIDs) as basic, low-loss elements of thin-film metamaterials has one main advantage: Their resonance frequency is easily tunable by applying a weak magnetic field. The downside, however, is a strong sensitivity to stray and inhomogeneous magnetic fields. In this work, we demonstrate that even small magnetic fields from electronic components destroy the collective, resonant behaviour of the SQUID metamaterial. We also show how the effect of these fields can be minimized. As a first step, magnetic shielding decreases any initially present fields including the earth's magnetic field. However, further measures like improvements in the sample geometry have to be taken to avoid the trapping of Abrikosov vortices.

References in corpus (1)

• Tunability of Superconducting Metamaterials

Cited by in corpus (8)

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• Coherent Oscillations of Driven rf SQUID Metamaterials
• Wide-Band Tuneability, Nonlinear Transmission, and Dynamic Multistability in SQUID Metamaterials
• Imaging collective behavior in an rf-SQUID metamaterial tuned by DC and RF magnetic fields
• Ultra-compact tunable split-ring resonators
• Electrically and Magnetically Resonant dc SQUID Metamaterials