Interaction of magnetic vortices with defects

A. S. Kovalev; Jaroslaw E. Prilepsky

doi:10.1063/1.5041432

Interaction of magnetic vortices with defects

A. S. Kovalev, Jaroslaw E. Prilepsky

Aston Institute of Photonic Technologies (AiPT)

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Abstract

Scattering of magnetic vortices and vortex pairs by a magnetic defect in two-dimensional easy-plane ferromagnets was theoretically studied using classical equations of magnetization dynamics and the approximation of collective variables for the coordinates of vortices. A defect model was proposed as a local region of a magnet whose exchange interaction differs from that of the remaining part. The rotation of the magnetic vortex around the defect and the associated scattering of vortex pairs (vortex-antivortex bound states) were considered. In the limit of small-angle scattering, analytical expressions were obtained for the differential scattering cross section and the dependence of the scattering angle on the parameters of the vortex pair, defect and impact distance. The scattering of vortex pairs by a defect was studied, numerically and qualitatively, in the entire range of scattering parameters. Our study indicated that the impact parameter has critical values at which the scattering pattern changes in a qualitative manner and defect-localized rotational states of vortex pairs possibly exist.

Original language	English
Pages (from-to)	663-670
Journal	Low Temperature Physics
Volume	44
Issue number	7
DOIs	https://doi.org/10.1063/1.5041432
Publication status	Published - 6 Jul 2018

Bibliographical note

Copyright © 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Low Temperature Physics 44, 663 (2018) and may be found at https://doi.org/10.1063/1.5041432

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10.1063/1.5041432

Interaction of magnetic vortices with defects
Copyright © 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Low Temperature Physics 44, 663 (2018) and may be found at https://doi.org/10.1063/1.5041432
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title = "Interaction of magnetic vortices with defects",

abstract = "Scattering of magnetic vortices and vortex pairs by a magnetic defect in two-dimensional easy-plane ferromagnets was theoretically studied using classical equations of magnetization dynamics and the approximation of collective variables for the coordinates of vortices. A defect model was proposed as a local region of a magnet whose exchange interaction differs from that of the remaining part. The rotation of the magnetic vortex around the defect and the associated scattering of vortex pairs (vortex-antivortex bound states) were considered. In the limit of small-angle scattering, analytical expressions were obtained for the differential scattering cross section and the dependence of the scattering angle on the parameters of the vortex pair, defect and impact distance. The scattering of vortex pairs by a defect was studied, numerically and qualitatively, in the entire range of scattering parameters. Our study indicated that the impact parameter has critical values at which the scattering pattern changes in a qualitative manner and defect-localized rotational states of vortex pairs possibly exist.",

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AU - Prilepsky, Jaroslaw E.

N1 - Copyright © 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Low Temperature Physics 44, 663 (2018) and may be found at https://doi.org/10.1063/1.5041432

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N2 - Scattering of magnetic vortices and vortex pairs by a magnetic defect in two-dimensional easy-plane ferromagnets was theoretically studied using classical equations of magnetization dynamics and the approximation of collective variables for the coordinates of vortices. A defect model was proposed as a local region of a magnet whose exchange interaction differs from that of the remaining part. The rotation of the magnetic vortex around the defect and the associated scattering of vortex pairs (vortex-antivortex bound states) were considered. In the limit of small-angle scattering, analytical expressions were obtained for the differential scattering cross section and the dependence of the scattering angle on the parameters of the vortex pair, defect and impact distance. The scattering of vortex pairs by a defect was studied, numerically and qualitatively, in the entire range of scattering parameters. Our study indicated that the impact parameter has critical values at which the scattering pattern changes in a qualitative manner and defect-localized rotational states of vortex pairs possibly exist.

AB - Scattering of magnetic vortices and vortex pairs by a magnetic defect in two-dimensional easy-plane ferromagnets was theoretically studied using classical equations of magnetization dynamics and the approximation of collective variables for the coordinates of vortices. A defect model was proposed as a local region of a magnet whose exchange interaction differs from that of the remaining part. The rotation of the magnetic vortex around the defect and the associated scattering of vortex pairs (vortex-antivortex bound states) were considered. In the limit of small-angle scattering, analytical expressions were obtained for the differential scattering cross section and the dependence of the scattering angle on the parameters of the vortex pair, defect and impact distance. The scattering of vortex pairs by a defect was studied, numerically and qualitatively, in the entire range of scattering parameters. Our study indicated that the impact parameter has critical values at which the scattering pattern changes in a qualitative manner and defect-localized rotational states of vortex pairs possibly exist.

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VL - 44

SP - 663

EP - 670

JO - Low Temperature Physics

JF - Low Temperature Physics

IS - 7

ER -

Interaction of magnetic vortices with defects

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