Quasi-ballistic magnetization switching in Co/Pt dots with perpendicular magnetization

摘要

A transverse pulse magnetic field with fast rise time generates precessional motion of magnetization due to finite torque. If the torque is sufficiently large enough magnetization may switch irreversibly via a ballistic trajectory even when energy barrier exists between two energetically stable states. We demonstrate magnetization switching in Co/Pt multilayer nanostructured dots via quasi-ballistic magnetization motion excited by a pulse field with subnanoseconds rise time. The quasi-ballistic switching has been found when the rise time of a pulse field is comparable to the half of magnetization precession period, beating the Stoner-Wohlfarth switching limit.