Hole-vortex-magnon interactions in diluted layered antiferromagnets with planar symmetry

A. R. Pereira and G. M. Wysin
Phys. Rev. B 73, 214402 – Published 1 June 2006

Abstract

We investigate the scattering of spin wave or magnon modes on planar vortices pinned on holes in two-dimensional (2D) easy-plane antiferromagnets. Numerical methods on a discrete lattice and analytical calculations in a continuum model are considered. Numerical calculations use systems centered on a lattice site, whose spin is removed. The continuum treatment is based on a simple approach that solves the equations of motion on a 2D support manifold not simply connected (i.e., containing a circular hole, which can be seen as a spin vacancy). The phase shifts for the scattered states are obtained and a comparison between numerical and analytical results is discussed. The vortex instability local mode is analyzed as a function of the hole size by several approaches. Its frequency is found to go to zero at a critical hole size. Larger holes are found to be more effective for stabilizing vortices in the planar configuration.

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  • Received 10 February 2006

DOI:https://doi.org/10.1103/PhysRevB.73.214402

©2006 American Physical Society

Authors & Affiliations

A. R. Pereira*

  • Departamento de Física, Universidade Federal de Viçosa, Viçosa, 36570-000 Minas Gerais, Brazil and Physics Department, University of Bologna, Via Irnerio 46, I-40126 Bologna, Italy

G. M. Wysin

  • Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601, USA

  • *Electronic address: apereira@ufv.br
  • Electronic address: wysin@phys.ksu.edu; URL: http://www.phys.ksu.edu/personal/wysin

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Vol. 73, Iss. 21 — 1 June 2006

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