  This paper investigates tunable magneto-plasmons in graphene-based structures
combined with gyro-electric layers. In the general waveguide, each graphene
sheet has been sandwiched between two different gyro-electric layers. The whole
structure has been exposed in the presence of a magnetic bias. An accurate
analytical model based on all propagating modes has been proposed and led to
closed-form complicated relations. As a special case of the multi-layer
waveguide, a hybrid graphene-gyroelectric structure is studied in this paper.
It has been illustrated that the propagating features of the exemplary
waveguide can be tuned by changing the external magnetic bias and the chemical
potential of graphene, which makes it a new tunable platform for the design of
non-reciprocal plasmonic devices in the THz region.
