Discrete magnetic breathers in monoaxial chiral helimagnet

Intrinsic localized spin modes, or discrete breathers, are investigated in the forced ferromagnetic state of a monoaxial chiral helimagnet. The approximate solution of these excitations are obtained with the aid of discrete equations of spin dynamics. Conditions on the frequency of the breathers and on the easy-plane anisotropy are established under which the breathers are possible. In the presence of Dzyaloshinskii — Moryia interaction the localized spin modes become spatially modulated and, as a consequence, acquire the chirality. Energy of these excitations, including a pinning potential, is calculated.