Normal modes of vortices in easy-plane ferromagnets

G. M. Wysin and A. R. Völkel
Phys. Rev. B 52, 7412 – Published 1 September 1995
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Abstract

We investigate the linear spin-wave spectrum of two-dimensional easy-plane classical Heisenberg ferromagnets in the presence of a vortex, using numerical diagonalization on small systems. The spectra of normal modes for both in-plane and out-of-plane vortices are determined, for square, triangular, and hexagonal lattices. Some of the modes show a strong localization of their amplitudes near the center of the vortex. Moreover, we investigate a particular mode that drives the crossover in the static vortex structure from purely in-plane to a vortex with well-localized out-of-plane component as the easy-plane character of the system is reduced below a certain threshold.

  • Received 8 May 1995

DOI:https://doi.org/10.1103/PhysRevB.52.7412

©1995 American Physical Society

Authors & Affiliations

G. M. Wysin

  • Department of Physics, Kansas State University, Manhattan, Kansas 66506

A. R. Völkel

  • University of Toronto, Toronto, Ontario, Canada M5S 1A7

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Vol. 52, Iss. 10 — 1 September 1995

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