Micromagnetic analysis of dynamical bubble-like solitons based on the time domain evolution of the topological density

Dynamical bubble-like solitons have been recently investigated in spintronic nanooscillators with perpendicular materials. Those magnetic configurations can be also characterized by determining the associated topological density. In this paper, a systematic study of the influence of both external field and high current on that dynamics is performed for a spin-valve point-contact geometry. The usage of the topological density tool highlights the excitation of complex bubble/antibubble configurations. In particular, at high currents, a deformation of the soliton and its simultaneous shift from the contact area are observed and can be ascribable to the Oersted field. Results provide further detailed information on the excitation of solitons in perpendicular materials for application in spintronics, magnonics and domain wall logic.