Fizika Nizkikh Temperatur: Volume 31, Number 8-9 (August 2005), p. 968-973    ( to contents , go back )

The frustrated vortex in a two-dimensional antiferromagnet

M.M. Bogdan

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: bogdan@ilt.kharkov.ua
pos Анотація:

Received April 6, 2005

Abstract

Interaction between a magnetic vortex and a frustration created by a magnetic defect is investigated in the framework of the discrete Heisenberg model of a two-dimensional antiferromagnet with the easy-plane anisotropic exchange. Solutions of the static Landau–Lifshitz equations are found numerically, which describe the spin distributions in the magnetic frustration–vortex system. It is revealed that the total energy of the magnet reaches a minimum value in the case where the vortex center coincides with the magnetic impurity position. It is shown that the attraction between the vortex and the frustration gives rise to a two-dimensional solitonic bound state, a frustrated vortex, in the magnet. The energy of the vortex is less than the energy of a free vortex, and this effect can manifest itself in the behavior of EPR line half-width in two-dimensional magnets.

PACS:
75.10.Hk - Classical spin models
75.30.Hx - Magnetic impurity interactions
75.40.Mg - Numerical simulation studies
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