Effect of perpendicular magnetic field on bubble-like magnetic solitons driven by spin-polarized current with Dzyaloshinskii–Moriya interaction

Abstract

The topological properties of bubble-like magnetic solitons can be modified by interfacial Dzyaloshinskii-Moriya interaction (DMI). In this paper, the dynamic responses of bubble-like magnetic solitons nucleated in the free layer of the spin-torque nano-oscillators (STNOs) are investigated in the presence of DMI and the perpendicular magnetic field by using micromagnetic simulations. We observed that the oscillation frequency of bubble-like magnetic solitons can be manipulated by the perpendicular magnetic field. Moreover, the magnetic structures keep stable in small DMI. With an increase in the DMI strength, rich kinds of bubble-like magnetic solitons appear at different spin-polarized current and perpendicular magnetic field. These results provide a further understanding of bubble-like magnetic solitons structures and direct applications in STNOs.