Magneto-optical properties of highly Al-substituted (Y,Bi)3 (Fe,Al)5O12 sputtered films in short wavelength region

The films were prepared on 7059 glass substrates by RF sputtering. The effect of Al substitution on the magnetic and structural properties of Bi-substituted films is discussed. The limit of Bi substitution into the garnet phase was clarified for Al-substituted and nonsubstituted films. The microstructure of the films at the limiting composition and segregation compositions was examined by transmission electron microscopy and transmission high-energy electron diffraction observations. The electron and X-ray diffraction analyses for this composition range showed some diffraction peaks which could not be assigned to the garnet phase or the Bi₂Fe₄O₉ phase