Dynamics of topological defects in a two-dimensional magnetic domain stripe pattern

Abstract

Two dimensional magnetic films with perpendicular magnetization spontaneously form magnetic domain patterns that evolve or undergo symmetry transformations as a function of temperature. When the system is driven from equilibrium by a rapid change in temperature, topological pattern defects are the elementary pattern excitations that affect this evolution. An elastic continuum model is adapted to describe how a metastable population of topological defects alters the domain density and the magnetic susceptibility of the "stripe" magnetic domain pattern. Temporal changes in the susceptibility are interpreted using a dynamical equation describing the defect population. Recent experiments provide a quantitative verification of the model, and illustrate the use of the magnetic susceptibility to follow the population dynamics of topological defects in this system, and its potential role in investigating a pattern melting phase transition.

arXiv comment8 pages, 5 figures

References in corpus (4)

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Cited by in corpus (8)

• Topological defects and misfit strain in magnetic stripe domains of lateral multilayers with perpendicular magnetic anisotropy
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• Annihilation dynamics of stringlike topological defects in a nematic lyotropic liquid crystal
• Monte Carlo simulation of the effects of higher order anisotropy on the spin reorientation transition in the two dimensional Heisenberg model with long range interactions
• Domain-wall free energy in Heisenberg ferromagnets
• Local and long-range realizations of a spin-reorientation surface phase transition
• Antipersistent behavior of defects in a lyotropic liquid crystal during annihilation
• Comparison of dynamical and equilibrium surface spin-reorientations: Inferences on the nature of the phase transitions in the presence of dipole interactions