Static and dynamic studies of bubble wall states in tilted ion implanted garnets

Two kinds of bubbles, small circular bubbles and normal elliptical bubbles, have been observed at the same bias field in [111] misoriented (YSm Lu Ca)
3
(Fe Ge)
5
O
12
H+ implanted samples. Static and dynamic experiments were performed on these bubbles in order to characterize them. Strong in-plane orthorombic like anisotropy exists in these samples and these two kinds of bubbles may be correlated with the eight wall states observed by Konishi in [110] oriented garnet films. Transitions from normal to small bubbles occured only when the in-plane field was applied along the easy axis of magnetization of the implanted layer. The behaviour of closure domains seems to be preponderant for driving the observed transitions.