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Pendry et al. were able to show that a three-dimensional array of intersecting, thin wires could be used to create negative values of permittivity (or "ε"), and that a periodic array of copper split ring resonators could produce an effective negative magnetic permeability (or "μ").
However at optical frequencies, values of magnetic permeability for natural materials are not measurably different from Split ring
Split-ring resonator is a unit which enhances magnetic permeability and magnetic coupling for metmaterials.