Low Temperature Physics: 44, 663 (2018); https://doi.org/10.1063/1.5041432
Fizika Nizkikh Temperatur: Volume 44, Number 7 (July 2018), p. 847-856    ( to contents , go back )

Magnetic vortices interaction with defects

A.S. Kovalev

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
V.N. Karazin Kharkiv National University, Kharkiv 61077, Ukraine
E-mail: kovalev@ilt.kharkov.ua

J.E. Prilepskii

Aston University, Birmingham, UK

Received March 2, 2018

Abstract

Magnetic vortices and vortex pairs scattering by mag-netic defects in 2D easy-plane ferromagnetic is investi-gated in the frame of classical equations of magnetization dynamics and in the collective variables approach for the vortices coordinates. The model for defect as the magnet-ic domain with exchange interaction differing from the same for the main matrix was suggested. The magnetic vortex rotation about the defect and the vortex pair scat-tering by defect was considered. The analytical expres-sion for differential scattering cross-section and the de-pendence of the scattering angle on the parameters of vortex pair, defect and impact parameter were obtained in the limit of small-angle scattering. Vortex pairs scattering by defect was investigated numerically and by qualitative analysis in the wide region of the scattering parameters. The character of the scattering changes qualitatively at the critical value of impact parameter. It was demonstrated the possibility for existence of vortex pairs rotary states localized near defects.

PACS: 75.10.–b General theory and models of magnetic ordering;
PACS: 75.10.Hk Classical spin models.

Key words: easy-plane ferromagnet, magnetic defects, magnetic vortex, vortex pair, Thiele equation, vortex scattering, scattering cross section.

Published online: May 28, 2018

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