Influence of an External Magnetic Field on the Dynamics of a New-Phase Nucleus in the Vicinity of the First-Order Phase Transition in Magnets With Defects Present

Abstract

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.

Autoresonance control model of nonlinear dynamics of magnetization in a three-layer antiferromagnetic structure in the presence of attenuation

“…2, кривая 3) при большем затухании. При таких параметрах (малой ширины d) в отсутствии внешнего воздействия начальный зародыш превращается в затухающий бризер [34], либо в постоянном поле он локализуется на дефекте [35]. В переменном поле, как показывает анализ уравнений (7), можно получить растущие решения (Рис.…”

Resonant Dynamics of the Domain Walls in Multilayer Ferromagnetic Structure

“…In the first approach, often used to study the dynamics of spin waves, to describe the dynamics of magnetization in a layer, the Landau-Lifschitz equation is used with constant material parameters; in this case the fulfillment of certain boundary conditions is required at the layers interfaces [2]. In the second approach, the presence of layers that differ from each other in values of one or several magnetic parameters is taken into account via the spatial modulation of the magnetic parameters of the material (see, e.g., [3,4]). The presence of local and periodic onedimensional spatial modulation of the magnetic parameters of material (SMMP) influences on the propagation, spectrum, and damping of spin waves, and the high-frequency properties.…”

Numerical simulation of the generation of multisoliton type magnetic inhomogeneities in ferromagnets with inhomogeneous parameters

“…For ferromagnetic materials, it is common practice to use the approximation of the defect in the form of a planar (or plate like) magnetic inclusion, which is considered to be finite in thickness [2,3]. The influence of planar magnetic inclusions on the static and some dynamic properties of magnetic inhomogeneities was investigated using both the analytical and numerical methods [2][3][4][5][6][7]. It should be noted that multilayer magnetic structures are investigated using the models that take into account both the local and periodic spatial modulations of the magnetic parameters of the material (see, for example, [8,9]).…”