Growth-induced anisotropy

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Abstract
The occurrence of a non‐cubic anisotropy, related to the orientation of the growth face during crystal formation, is vital to garnet bubble memories; the effect is also present in amorphous GdCo bubble films. In addition, the effect has great fundamental interest as the only trace in the bulk material of the dynamics of the crystal growth process. The detailed mechanisms of the growth‐induced anisotropy will be described, with experimental evidence for each of the mechanisms in particular systems. All of the mechanisms are subject to the same symmetry considerations which, in turn, determine the symmetry properties of the induced anisotropy. Hence, symmetry does not distinguish among the mechanisms. Simple parametrization of the symmetry theory gives rise to the ’’two‐parameter model’’. Experimental data increasingly deviates from this simple representation. The dynamics of the growth process on the crystal face will be discussed in some detail, with particular emphasis on the sources of the deviations from the two‐parameter model.

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