  This article proposes a novel analytical model for the anisotropic
multi-layer structures containing magnetically biased graphene sheets. The
multi-layer structure is composed of various magnetic materials. An external
magnetic field is applied, normal to the structure surface. Each graphene
sheet, with an anisotropic conductivity tensor, has been sandwiched between two
adjacent magnetic materials. Our model is used to find the dispersion relation
of the structure. Now, obtaining plasmonic features of the structure, such as
the effective index and propagation loss is straightforward. Four exemplary
structural variants have been investigated to show the richness of the proposed
general structure regarding the related specific plasmonic wave phenomena and
effects. These aspects are essential to form our structural design platform to
propose novel plasmonic devices such as biosensors, modulators, absorbers,
transparent electrodes, and tunable metamaterials in THz frequencies. A very
good agreement between the analytical and full-wave simulation results is seen.
