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The saturation magnetization Mₒ, the uniaxial anisotropy Kₔ, the optical absorption, the Faraday rotation ₅, and the Faraday ellipticity ₅ of epitaxial garent films of composition Y₃-ₗBiₗFe₅O₁₂ and Y₃-ₘPbₘFe₅O₁₂ have been investigated for x1. 7 and y0. 25. The magnetostriction constants ₁₀₀, ₁₁₁ and the cubic anisotropy K₁ were studied on flux-grown crystals for x1. The temperature dependence of Mₒ, K₁, Kₔ, ₁₀₀, ₁₁₁, and ₅, ₅ at 633 nm has been measured in the range 4. 2 KT₂. The concentration dependence of these properties is linear. In particular, the contribution of the bismuth and lead to the Faraday rotation {₅}x and {₅}y at =633 nm turned out to be -25 400 and -18 500 deg cm^-1 at T=4. 2 K and -20 600 and -18 400 deg cm^-1 at T=295 K, respectively. The temperature dependence of ₅ and ₅ can be described in terms of the sublattice magnetizations inferred from the fit of the molecular-field theory to the measured saturation magnetization. The extracted magneto-optical coefficients reveal a nonlinear concentration dependence. The magnitude of the growth-induced anisotropy is essentially controlled by the supercooling of the melt for both the lead- and bismuth-substituted films. The temperature dependence of Kₔ^g is discussed in terms of the single-ion theory.
Hansen et al. (Wed,) studied this question.