Anisotropy and Magnetostriction Measurements on (Ca+V+In)-Substituted YIG

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Abstract
Garnet crystals of the general composition {Ca2xY3−2x} [InvFe2−v] (VxFe3−x)O12 were obtained by flux growth in the ranges 0[equal to or less than]x[equal to or less than]1 and 0[equal to or less than]y[equal to or less than]0.35. The individual compositions of the crystals were determined by electron microprobe and confirmed by lattice parameter, magnetization Ms and Curie point Tc measurements. By microwave resonance techniques, magnetostriction constants λ100, λ111 (at room temperature) and magnetic anisotropy constants K1, K2 (with 4K[equal to or less than]T[equal to or less than]300K) were determined. The function |K1(x)| at T = 4K is nonlinear and exhibits a maximum at x≈0.20, as the well known Tc(x) does.1 The magnetostriction constants are both negative and vary between −1.5×10−6 and −4.3×10−6 with composition. These single-crystal data are supplemented by polycrystalline resonance lineshape studies on compositions with 0.8[equal to or less than]x[equal to or less than]1.3, at 4K<T<300K. With these new anisotropy data, the polycrystalline resonance linewidth follows the recent theoretical predictions of Schlömann2 over a wide range of ρ=K12/(21π2Ms4).

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