A conversion electron Mössbauer spectroscopy study on ion-implanted bubble garnets

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Abstract
Conversion electron Mössbauer spectroscopy (CEMS) has been used to investigate the effects of ion implantation on the magnetic properties of bubble garnets. A decrease of the average hyperfine fields and therefore of the magnetization is observed with increasing implantation dose. Differences with the interpretation of CEM spectra from substituted YIG films, which recently apppeared in the literature, are resolved. Depth-selective Mössbauer spectra are obtained by combining etch experiments and CEMS measurements with the theory recently proposed for integral CEMS by Liljequist. In this way the hyperfine fields can be obtained at various depths, and quantitative estimates of the reduction of the magnetization through an implanted layer can be made.