The evolution of a new phase nucleus near the first order spin reorientation phase transition in magnets has been investigated. A strong influence of one dimensional magnetic anisotropy "defects" on the nucleation dynamics has been shown. The conditions of the localization of the new phase nucleus in the region of the magnetic anisotropy "defect" have been determined.
Theoretically, with the aid of a soliton model, the evolution of a new-phase nucleus near the first-order spin-reorientation phase transition in magnets has been investigated in an external magnetic field. The influence of an external field and one-dimensional defects of magnetic anisotropy on the dynamics of such nucleus has been demonstrated. The conditions for the localization of the new-phase nucleus in the region of the magnetic anisotropy defect and for its escape from the defect have been determined. The values of the critical fields which bring about the sample magnetization reversal have been identified and estimated.
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