Some hydrogen implantation effects in bubble garnets

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Abstract
A classical (Y,Sm,Lu,Ca)3 (Fe,Ge)5O12 bubble garnet has been implanted with 1.5×1016 H+2 cm−2 at 60 keV either directly or through a predeposited 100-A-thick silica layer. The damage and ion implant profile were determined as well as the maximum strain and some magnetic properties of an as-implanted sample. The evolution of certain of these parameters have been studied after different well-chosen annealing treatments. From these observations it has been possible to dissociate the abnormal ‘‘chemical’’ from the usual magnetic effects. A certain mechanical contribution of the silica overcoat to the implanted layer has been displayed.