▎ 摘　　要

We propose here the concept and practical design of THz metamaterial devices consisting of subwavelength graphene nanostructures placed on a dielectric substrate and backed by a metal gate. This geometry allows us to introduce the design of a THz metaferrite screen with effective permeability that can be tuned from positive to negative, as a function of graphene's Fermi energy. We then discuss its potential applications to realize tunable and switchable THz and far-infrared artificial magnetic screens, perfect absorbing films, and polarizing filters.