Abstract
Magnetic properties of Nd3−xBixFe5O12 (0 ≤ x ≤ 3) films prepared by metal organic decomposition on Gd3Ga5O12(100) substrates have been investigated. The Faraday rotation angle θF increased with bismuth concentration. The uniaxial anisotropy constant Ku, cubic magnetocrystalline anisotropy constant K1, gyromagnetic ratio γ, g-factor, and FMR line width ΔH were determined by ferromagnetic resonance measurements. Ku was positive and K1 was negative for all samples. Ku decreased from 9.83 × 104 to 2.05 × 104 erg/cm3 as x increased from 0 to 3. K1 was almost constant irrespective of x, and it took a value between −3.28 × 104 and −2.08 × 104 erg/cm3. γ, g-factor, and ΔH also decreased with increasing bismuth concentration. From the results of the investigation of the in-plane tensile strain applied to the films, the effect of strain on Ku is considered to be small.
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