Faraday Rotation Properties of Eu_1-xMn_xO-Al₂O₃-SiO₂ Glasses

Abstract

Faraday rotation properties of Eu_1-xMn_xO-Al₂O₃-SiO₂ glasses were investigated for x = 0 and 0.02 at 632.8 nm at 15 ~ 250 K in pulsed magnetic fields. For x = 0, the Verdet constant V, that is defined by Faraday Angle = VBL (B : magnetic fields, L: sample length) was gradually varied up to 150 K and rapidly decreased above it. On the other hand, the sample of x = 0.02 exhibited less temperature dependence and its Verdet constant was higher at 250 K than for x = 0. This is attributable to antiferro-coupling between Eu²⁺ and Mn²⁺ ions, which was supported by the negative Curie temperature in the magnetization behavior for x = 0.02.