Cuフェライト膜のJahn-Teller歪みと磁気特性

概要

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The crystal structure of copper iron oxide (CuFe_2O_4:Cu-ferrite) is transformed from cubic spinel to tetragonal symmetry by the Jahn-Teller (J-T) distortion. The degree of J-T distortion σ is theoretically given by the function σ=σ_0 tanh(|A|σ/k_BT), where σ_0 is the degree of the distortion at 0 K, A is the energy term involved in the distortion, k_B is Boltzmann's constants, and T is the absolute temperature. The films were prepared by vacuum evaporation and solid reaction, and their crystal structure, magnetic coercive force, and initial magnetization energy were investigated. The temperature dependence of the shify of the Bragg angle △2θ for XRD, the coercive force H_c, and the initial magnetization energy E_I were well fitted to the function C tanh (α/T-β), where C, α, and β are constants determined by experiment. Consequently, the interaction between the distortion and magnetic properties of Cuferrite films was considered to be caused by J-T distortion, and expenmental results agreed with the theorem of J-T distortion.
社団法人日本磁気学会の論文
1998-04-15