Strong dynamic magnetoelectric coupling in metamaterial

Magnetoelectric susceptibility (ξ) of classical magnetoelectrics is always substantially smaller that the geometric average of the electric ([χ.sub.e]) and magnetic ([χ.sub.m]) susceptibilities. Materials reaching the equality [ξ.sup.2] = [χ.sub.e][χ.sub.m] as a limiting value may thus be considered as ideal magnetoelectrics. Here we investigate the magnetoelectric susceptibility of a metamaterial built from split ring resonators both experimentally and within an equivalent circuit model. Due to a direct proportionality between electric polarization and magnetization, the magnetoelectric susceptibility of this metamaterial fulfils the equality [ξ.sup.2] = [χ.sub.e][χ.sub.m] at least in the dynamic regime.