Influence of dislocations on the magnetic structure of two-dimensional anisotropic antiferromagnets

For an easy-plane antiferromagnet having anisotropy in the easy plane and c ontaining an edge dislocation, a two-dimensional model is formulated which generalizes the Peierls model to the case of coupled fields of magnetizatio n and elastic displacements. The proposed model is used to obtain a system of one-dimensional nonlinear integrodifferential equations for the two coup led fields. In the case of ideal crystal structure of the antiferromagnet t his system of equations has a solution for a domain wall containing a Bloch line, the structure into which the magnetic vortex is transformed when the single-ion anisotropy is taken into account. In the presence of a dislocat ion a complex magnetostructural topological defect arises in the form of a 180 degrees domain wall terminating on the dislocation. (C) 2000 American I nstitute of Physics. [S1063-777X(00)01108-7].