Regimes of Magnetic Moment Oscillations in Domain Wall of the Dipole Chain

We report the dynamics of the magnetic moment numerically simulated for a single chain of magnetic nanodots affected by an external static or alternating field applied to the domain wall. It is shown that for a weak exchange interaction, the oscillations of the magnetic moment transverse components are a sequence of trains, while for a strong interaction, the dynamics approaches to a single-frequency harmonic oscillation. The amplitude and the frequency of these oscillations are determined by the energy of an interaction between the chain elements and by the external field, respectively. Various oscillation regimes induced by an external alternating field are studied. The effect of an easy-plane and easy-axis uniaxial anisotropy on the system dynamics is demonstrated.