Abstract:
The ground state and magnon spectrum (excluding the region of magnetostatic oscillations)
are found for a ferrodieleetric sample in the form of a triaxial ellipsoid. The treatment is
based on a microscopic Hamiltonian of the ferrodielectric that takes into account isotropic
exchange, Zeeman and dipole-dipole interactions, and also the energy of uniaxial magnetic
anisotropy. The frequency of homogeneous precession of the magnetization is also determined. The Tyablikov–Bonch-Bruevich regular perturbation theory for the mass operator
is used to calculate the damping due to three-magnon processes induced by the anisotropy;
the line width of homogeneous ferromagnetic resonance is also estimated.