We develop a theoretical description of electromagnon solitons in a coupled ferroelectric-ferromagnetic heterostructure. The solitons are considered in the weakly nonlinear limit as a modulation of plane waves corresponding to two electriclike and magneticlike branches in the spectrum. Emphasis is put on magneticlike envelope solitons that can be created by an alternating electric field. It is shown also that the magnetic pulses can be amplified by an electric field with a frequency close to the band edge of the magnetic branch.

• Received 6 October 2014
• Revised 8 January 2015

DOI:https://doi.org/10.1103/PhysRevB.91.041408