rf SQUID metamaterials

TL;DR

This paper investigates rf SQUID arrays as nonlinear magnetic metamaterials, demonstrating tunable negative permeability and oscillatory magnetic response, which could enable advanced magnetic control in metamaterial applications.

Contribution

It introduces the analysis of rf SQUID arrays as nonlinear metamaterials with tunable negative permeability within the effective medium approximation.

Findings

Demonstrates negative magnetic permeability above SQUID resonance frequency.

Shows permeability oscillates and can be tuned by changing the applied magnetic field.

Reveals nonlinear magnetic response in rf SQUID metamaterials.

Abstract

An rf superconducting quantum interference device (SQUID) array in an alternating magnetic field is investigated with respect to its effective magnetic permeability, within the effective medium approximation. This system acts as an inherently nonlinear magnetic metamaterial, leading to negative magnetic response, and thus negative permeability, above the resonance frequency of the individual SQUIDs. Moreover, the permeability exhibits oscillatory behavior at low field intensities, allowing its tuning by a slight change of the intensity of the applied field.