Garnets magnetic bubble memories

Garnets are important gems, abrasives, microwave systems components, magnetic bubble memories, and laser hosts. For the latter, yttrium aluminum garnet is the most important. It also plays an important role in aircraft turbines where it forms a protective coating on the turbine blades. 

Figure 9.11 Magnetic bubble memory schematic domains of reversed polarity (bubbles) are induced in the thin ferromagnetic garnet film.

Rare earth substituted garnet films for magnetic bubble memory applications... 

Yttrium aluminum garnet (YAG), Magnetic bubble memory devices... 

Liquid phase epitaxy (LPE) was used for forming thin garnet films for magnetic bubble memories. Describe the basic principles behind this technique. Would sputtering or evaporation be good alternative techniques for such films Explain how you arrived at your answer. 

The non-volatile bubble memories used for data storage are based on the principle of formation of magnetic domains in thin films grown on a gadolinium gallium garnet crystal substrate. Molecular engineering creates the precise film compositions for optimum performance. 

The development of the bubble domain memory has been remarkable in that since the discovery of the growth induced anisotropy in garnets, problems connected with materials have been relatively few and not too difficult to solve. A major reason is that the different sizes and magnetic properties of the rare earths offer a wide range of choices for the materials designer. 

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