Abstract
The results of a conversion electron Mössbauer spectroscopy (CEMS) study of Y 2Ca 1Fe 3.9Co 0.1Ge 1O 12 garnet are presented. The surface layer was investigated in an attempt to explain the observed magnetic after-effects. The Mössbauer parameters for two magnetic sextets corresponding to iron ions in tetrahedral and octahedral positions were obtained. The ratios of Mössbauer lines within each sextet were used to obtain the orientation of magnetic moment for each iron position indicating the non-collinearity of the 3+Fe in octahedral and tetrahedral positions. This effect may be explained by the influence of the concentration gradient of the strongly interacting ions in the surface layer. Moreover there is an indication of the paramagnetic phase presence in the surface layer. The results of the measurements performed for comparison on YIG also allow us to make a similar hypothesis about the presence of a paramagnetic fraction and the noncollinearity of the iron ions.
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