Magneto-Optical Properties of Pr, Ni- and Ce, Ni-Substituted YIG Epitaxial Films Prepared by Sputtering
نویسندگان
چکیده
Films of Y,R,(Fe, Ni),O,, @=PI, Ce) have been epitaxially grown in situ on G&G%O,, ( 1 1 1 ) 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, PI, 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 PI4'.
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