Effect of Magnetic Field and Bias Field on Regulation of Oscillation Mode of Vortex Domain Wall
The oscillation behavior of domain walls in nanostructures presents significant potential for applications in microwave nano-oscillators.Using the micromagnetic simulation,the oscillation mode of vortex domain walls in nanowires driven by different magnetic fields is studied,and the effect of varying bias fields on the oscillation mode of the vortex domain wall under the same magnetic field is also explored.Results reveal that,under distinct external magnetic fields,the chirality of the vortex domain wall progresses from a chirality-stable vortex state to an alternating vortex and anti-vortex state,eventually reaching a stable vortex state with altered chirality.The oscillation frequency of the vortex increases first,then decreases,and consequently increases with the increase of the external magnetic field.The results also show that the bias field can control the vortex's chirality under the same external magnetic field.Changing the magnitude of the bias field can switch a vortex domain wall back and forth between the mode in which the chirality is stable,the mode in which the vortex and anti-vortex appear alternately,and the mode in which the chirality changes.The trend in oscillation frequency variation with bias field mirrors that observed with an applied magnetic field.This study provides a new idea for the multi-channel regulation of oscillation modes of new nano-oscillators based on domain walls.
vortex domain wallchiralityoscillation frequencymicromagnetic simulationbias field
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