1996 年 20 巻 S_1_MORIS_96 号 p. S1_161-164
At λ= 633 nm, very accurate measurements of the Faraday rotation on epitaxial garnet films of the composition {R3-xBix}[Fe2](Fe3)O12 with R = Dy, Y and high Bi content (x ≅ 1.30) are reported, in the temperature range 10 -620 K under magnetic field up to 20 kOe applied along the [111] direction. The analysis of the data in terms of the sublattice magnetization reveals, at low temperatures, a large contribution of the rare earth {c } sublattice induced by the Bi substitution. This enhancement of the "electric" dipole Faraday rotation is strongly temperature dependent and vanishes at room temperature. This result is compared with that observed for the same Bi-substituted rare earth iron garnets in the near infra-red band.