MICRON-SIZE BUBBLE DYNAMICS AND STATE STABILITY IN LOW-DAMPING MAGNETIC GARNET FILM

Bubble-state dynamics are stability are studied in a small-bubble low- damping garnet film. It is shown that the dynamics of bubbles with S n on-equal 0 is determined by the gyrotropic and coercive forces. As a r esult, the bubble translation velocity depends strongly on the bubble state, while the bubble skew angle does not. The coercivity and the ve locity saturation are responsible for the existence of a limiting bubb le skew angle of less than pi/2. The Bloch point coordinates versus th e in-plane field are obtained from the experimental data, and good agr eement is found with the prediction of the theoretical model. Four bub ble states are identified in the presence of an in-plane field: a sing le S0 state, a chi state, a state with two Bloch lines and a Bloch poi nt (S), and a state with two Bloch lines and two Bloch points (S**). A model is presented which explains the static transitions between bub ble states under the influence of an in-plane field.