テルビウムホウ酸塩ガラスの磁気光学特性へのマンガン添加効果

概要

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Dynamical Faraday rotation measurement with the high magnetic fields of〜16 T has revealed the presence of microscopic magnetic coupling among trivalent terbium (Tb^3+) ions at low temperature in Tb_2O_3-riched borate glasses, caused by the superexchange interaction via oxygen ion. Doping by the divalent manganese (Mn^2+) ions into Tb_2O_3-B_2O_3 glass made the magnetic correlation temperature (T_MC) rising from 120 to 250 K, due to the formation of stronger antiferromagnetic couplings between Tb^3+ and Mn^2+ ions. The repetitional application of the 16T-pulsed magnetic fields at lower temperature than 30 K destroyed the magnetic couplings so that the Faraday rotation could be enhanced. After the operations, the Faraday rotation curves at 300 K were drastically changed upon the incorporation of Mn^2+ ions.
社団法人日本セラミックス協会の論文
2002-11-01