Ferromagnetic resonance in media with an inhomogeneous saturation magnetization
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The method of transition probabilities is used to calculate the line width of ferromagnetic resonance in a medium with an inhomogeneous saturation magnetization. It is shown that in addition to linear (with respect to the Fourier components of the function describing inhomogeneities) terms, the perturbation Hamiltonian must include also quadratic terms. The frequency dependence of the contribution of the porosity to ΔH is fundamentally different from the frequency dependence of the magnetic anisotropy contribution. This anisotropy contribution ΔHa(ω) decreases on increase in the frequency and has a maximum at ω = (2/3)ωM, whereas the porosity contribution ΔHpω increases on increase in the frequency and vanishes at ω = (2/3)ωM.
KeywordsPorosity Fourier Anisotropy Line Width Frequency Dependence
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