Abstract
Bubble-state dynamics and stability are studied in a small-bubble low-damping garnet film. It is shown that the dynamics of bubbles with S ≠ 0 is determined by the gyrotropic and coercive forces. As a result, the bubble translation velocity depends strongly on the bubble state, while the bubble skew angle does not. The coercivity and the velocity saturation are responsible for the existence of a limiting bubble skew angle of less than π/2. The Bloch point coordinates versus the in-plane field are obtained from the experimental data, and good agreement is found with the prediction of the theoretical model. Four bubble states are identified in the presence of an in-plane field: a single S0 state, a χ state, a state with two Bloch lines and a Bloch point (S∗), and a state with two Bloch lines and two Bloch points (S∗∗). A model is presented which explains the static transitions between bubble states under the influence of an in-plane field.
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