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We propose a mechanism for magnon-plasmon coupling and hybridization inferromagnetic (FM) and antiferromagnetic (AFM) systems. The electric fieldassociated with plasmon oscillations creates a non-equilibrium spin density viathe inverse spin galvanic effect. This plasmon-induced spin density couples tomagnons by an exchange interaction. The strength of magnon-plasmon couplingdepends on the magneto-electric susceptibility of the system and the wavevectorat which the level repulsion is happened. This wavevector may be tuned by anapplied magnetic field. In AFM systems, the degeneracy of two chiral magnons isbroken in the presence of a magnetic field, and we find two separate hybridmodes for left-handed and right-handed AFM magnons. Furthermore, we show thatmagnon-plasmon coupling in AFM systems is enhanced because of strongintra-sublattice spin dynamics. We argue that the recently discoveredtwo-dimensional magnetic systems are ideal platforms to investigate proposedmagnon-plasmon hybrid modes.

Magnon-Plasmon Hybridization Mediated by Spin-Orbit Interaction in Magnetic Materials