| 摘要 |
PROBLEM TO BE SOLVED: To provide a Tb-Bi based garnet thick film material which is used as a Faraday rotation element having excellent magneto-optical properties at a 1.55 μm band, without following a conventional technique, and also to provide the production of this film material that involves using SGGG (Gd- Ca)3 (Ga-Mg-Zr)5 O12 ) as the substrate, replacing a part of Tb atoms by Ho or Yb atoms and increasing the Bi content. SOLUTION: This film material consists of a single crystal thick film which is grown by a liquid phase epitaxial growth method with NGG (Nd3 Ga5 O12 ) as the substrate and contains as major components, Tb, Bi, Fe and Al and also, contains 0 to 4.0 wt.% B2 O3 . This production involves subjecting the single crystal thick film to heat treatment while maintaining the film at 950 to 1,130 deg.C in an atmosphere having a >=5% oxygen concn. |
