Abstract

Soliton interactions with localized defects of different types in an anisotropic Heisenberg spin chain in nearest neighbour approximation are investigated. Evolutionary equations are derived after consistently applying semiclassical and continuum limits (spins are classical vectors and the length of the soliton excitations is larger than the lattice constant). Localized bound soliton-impurity solutions are obtained analytically for linear and nonlinear point defects and their stability is studied numerically. The influence of a defect spin modeled by a different exchange with its neighbors is analyzed in detail.

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