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Crystalline and magnetic properties of an ionimplanted layer in bubble garnet films

In this paper it will be shown that high bubble velocities can be realized in garnet films with orthorhombic anisotropy for 2-f.i m as well as for I-f.i m bubbles, if bubbles without Bloch lines have been used. Then the maximum velocity is at least 200 ms-I for 2-f.im bubbles and 100 ms-I for I-f.im bubbles. It appears that bubble diameter and collapse field of these bubbles strongly depend on the value and on the direction of the in-plane field. Small and large bubbles were observed simultaneously in the presence of in-plane fields. Much lower velocities and a strong scatter in the velocity data were observed for bubbles with other wall states.