paper

rf SQUID metamaterials

arXiv:cond-mat/0703400 · doi:10.1063/1.2722682

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.

3 pages, 4 figures, accepted by Applied Physics Letters, in production

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