Abstract

In previous studies of hard bubbles, these anomalous domains were found to exist in all unimplanted single‐layer LPE garnet films at room temperature. We have prepared five garnet film compositions in which it is not possible to generate hard bubbles at room temperature. These compositions are Y0.9Gd1.2Tm0.9Fe4.6Al0.1Ga0.3O12, Y0.9Gd1.5Yb0.6Fe4.5Al0.5O12, Y1.0Gd1.0Er1.0Fe4.5Al0.lGa0.4O12, Y1.5Eu0.75Gd0.75Fe4.4Al0.5Ga0.1O12 and Y2.0Tm1.0Fe4.1Ga0.9O12. All these films were prepared by standard LPE growth techniques and were not ion implanted or provided with any additional layers. The absence of hard bubbles in these films was inferred from the fact that all bubbles collapse within a 1.5% range of bias field even when the bubbles are generated by all the known techniques which normally produce hard bubbles. The dynamic behavior of these bubbles differs with the material composition. Some of this data indicates the presence of a small number of Bloch lines; however, the bubbles in one material all propagate ...

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