We address the dynamics of a localized molecular spin under the influence of external voltage pulses using a generalized spin equation of motion which incorporates anisotropic fields, nonequilibrium conditions, and nonadiabatic dynamics. We predict a recurring $4\pi$-periodic switching of the localized spin by application of a voltage pulse of temporal length $\tau$. The switching phenomena can be explained by dynamical exchange interactions, internal transient fields, and self-interactions acting on the localized spin moment.

• Received 19 June 2018

DOI:https://doi.org/10.1103/PhysRevB.98.174438