J. Phys. IV France 07 (1997) C1-723-C1-724
Magneto-Optical Properties of Pr, Ni- and Ce, Ni-Substituted YIG Epitaxial Films Prepared by SputteringM. Gomi, H. Toyoshima and T. Yamada
Department of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Tatsunokuchi, Ishikawa 923-12, Japan
Films of Y2R1(Fe, Ni)5O12 (R=Pr, Ce) have been epitaxially grown in situ on Gd3Ga5O12 (111) substrates by rf sputtering. Faraday rotation of Ce, Ni:YIG film decreased with valence change of Ce ions from 3+ to 4+ induced by Ni substitution. On the other hand, Pr, Ni:YIG films showed negative Faraday rotation in the visible which slightly increases in negative sign for Ni substitution. Magneto-optical spectrum measurement in a photon energy range extended to 4.2 eV indicated that the negative Faraday rotation in the visible is dominantly ascribed to a paramagnetic dispersion at 3.1 eV and the rotation increased by Ni substitution may be caused by spectral structure observed above 3.5 eV, associated with Pr4+.
© EDP Sciences 1997