SPIN STRUCTURE OF ANTIFERROMAGNETIC DISCLINATION

The spin structure of magnetic disclination, viz., spin inhomogeneity manifested in antiferromagnets in the presence of a dislocation, is an alyzed. The analysis is carried out on the basis of the discrete model as well as in the specially constructed generalized continual theory based on the local introduction of the antiferromagnetism vector I and taking into account the possibility of a change in the length of this vector. In the solution without singularities constructed for disclin ation, the modulus of the antiferromagnetism vector vanishes at the ce nter of the disclination. In the discrete model, the disclination ener gy depends significantly on the arrangement of spins near the core and on the type of their interaction. With the proposed model of spin arr angement, the results of numerical analysis based on the discrete and continual models are in good agreement. It is shown that planar discli nations are stable to the emergence of spins from the easy plane. (C) 1997 American Institute of Physics.