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• W2036085939 abstract "For finite-temperature micromagnetic simulations the knowledge of the temperature dependence of the exchange stiffness plays a central role. We use two approaches for the calculation of the thermodynamic exchange parameter from spin models: (i) based on the domain-wall energy and (ii) based on the spin-wave dispersion. The corresponding analytical and numerical approaches are introduced and compared. A general theory for the temperature dependence and scaling of the exchange stiffness is developed using the classical spectral density method. The low-temperature exchange stiffness $A$ is found to scale with magnetization as ${m}^{1.66}$ for systems on a simple cubic lattice and as ${m}^{1.76}$ for an FePt Hamiltonian parametrized through ab initio calculations. The additional reduction in the scaling exponent, as compared to the mean-field theory $(Aensuremath{sim}{m}^{2})$, comes from the nonlinear spin-wave effects." @default.
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• W2036085939 date "2010-10-26" @default.
• W2036085939 modified "2023-10-18" @default.
• W2036085939 title "Multiscale modeling of magnetic materials: Temperature dependence of the exchange stiffness" @default.
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• W2036085939 doi "https://doi.org/10.1103/physrevb.82.134440" @default.
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