Excitation and dynamics of spin solitons in chiral magnetization configuration

Abstract

This research paper presents systematic micromagnetic modeling of dynamic spin solitons carried by perpendicular magnetization component on a topologically preserved chiral sequence of uniform 360° in-plane domain walls with fixed boundaries in a strip. The long, narrow strip of a soft, magnetic thin film has a repeated in-plane magnetization pattern such that the local magnetization will rotate uniformly in a single chirality, either clockwise or counterclockwise, when moving along the strip in one direction at a constant speed. As spins in an excited soliton precess around its local magnetization field, the exchange interaction with the underlying chiral magnetization configuration yields a linear soliton motion with the direction determined by the handedness of precession and the underlying magnetization chirality. The local hyperbolic secant-like soliton profile holds its shape and energy when traveling without damping, continually changes its shape, and decays otherwise.