Abstract
The longitudinal magnetic susceptibility of quasi-three-dimensional easy-axis ferromagnets has been found. In this case, the ferromagnetic structure is considered as a fractal object with the dimension D = 3 − ɛ, where ɛ > 0. The approach is based on using a quasi-classical kinetic equation. The magnon dispersion strictly calculated using operations of the fractal differentiation is a strongly anisotropic (dependent on the parameter ɛ) function of angular variables, which leads to nontrivial frequency dependences of the magnetic susceptibility.
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