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Magneto‐optical properties of Al and In‐substituted CeYIG epitaxial films grown by sputtering (abstract)

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2 Author(s)
Gomi, M. ; Department of Materials Science, Japan Advanced Institute of Science and Technology, Asahidai 15, Tatsunokuchi, Ishikawa 923‐12, Japan ; Abe, M.

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Cerium substitution to iron garnet strongly enhances magneto‐optical (MO) effect in the visible region around hν=1.4 and 3.1 eV. We have previously proposed a Ce3+(4f)‐Fe3+ (tet.) charge transfer model as an electronic transition inducing the strong MO effect. In this study, we have measured Faraday spectra of CeYIG films in which Fe ions were diluted with Al or In ions. These ions, respectively, are known to preferentially occupy tetrahedral and octrahedral iron sites in the garnet structure, giving us some information on the role of Fe3+ in the MO enhancement. The Y2Ce1Fe5-xMxO12 (M=Al, In; x=0–5) films were epitaxially grown in situ on (111)‐oriented Gd3Ga5O12 (GGG) single crystal substrates by conventional rf diode sputtering. With the amounts of substitutions increasing, Faraday rotation and ellipticity of the films at hν=1.4 eV reduced at nearly the same rates for both ions of Al and In. We found from the analysis using molecular field theory that these reductions are in proportion to the magnetic moment of the tetrahedral iron sublattice. This indicates that the tetrahedral Fe3+ contributes to the electronic transition at 1.4 eV, supporting the proposed charge transfer model.

Published in:

Journal of Applied Physics  (Volume:75 ,  Issue: 10 )