Instability of bubble radial motion associated with chirality changes
Review articleOpen access

AbstractThe radial motion of magnetic bubbles submitted to expanding bias field pulses is studied by means of laser stroboscopy in a thin moderately damped garnet film. A bubble instability associated to a velocity breakdown appears periodically as the pulse amplitude increases. This experiment is performed on χ bubbles carrying no vertical Bloch lines (VBL's). The probability of state conversion is studied as a function of the pulse amplitude for the two initial chiralities and χ+ and χ-. In both cases four transitions associated to chirality changes are observed. If the pulse amplitude is close to the transition threshold VBL's can be nucleated so that the final bubble state is σ. Comparison of the two experiments shows that the critical amplitudes for bubble instability and chirality change are the same, the nucleation of VBL's being responsible for the bubble instability. A one dimensional model is presented that predicts the maximum average azimuthal angle ψ. A heuristic approach of the bifurcation associated to a chirality change is presented. The results are in good agreement with the experimental data and are compared to the horizontal Bloch line (HBL) model and the Walker model of wall motion.

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