Abstract
The influence of Bi, Pb, Pt, Mn and Ca ions on the Faraday rotation of the yttrium iron garnet LPE films was studied in the visible and near infrared region. By analysing the spectral behaviour of the difference Faraday rotation curves in terms of the paramagnetic and the diamagnetic crystal field transitions the individual contributions of the particular ions were determined. The main influence of Bi and Pb ions is shown by the modification of a large diamagnetic type transition occurring in pure YIG spectra at 2.86 eV. A presence of platinum leads to a uniform reduction of the FR spectrum of YIG. Manganese ions induce a diamagnetic type transition at 2.54 eV in agreement with the occurence of the three valent manganese in octahedral sites. The incorporation of calcium causes a paramagnetic type transition at 1.5 eV characteristic for the presence of tetrahedral four valent iron ions. Based on these considerations a phenomenological description of the observed spectral dependences of the studied samples is suggested.
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