The possible mechanisms of nucleation at a phase transition of the spin reorientation type in a real magnet are investigated by a phenomenological approach. The greatest attention is devoted to the fluctuation mechanism, in which the new-phase nuclei are modeled on the basis of ideas about magnetic inhomogeneities of the zero-degree domain wall type, and the sample considered is a cubic ferromagnet with uniaxial anisotropy induced along the [011] axis. It is shown that such inhomogeneities can represent stable formations if the finite size of the sample and the presence of defects in it are taken into account. The behavior of zero-degree domain walls is investigated for different values of the material parameters and defect characteristics, and their role in the kinetics of the spin-reorientation phase transition is elucidated.
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