Two-dimensional solitons in spin nematic states for magnets with an isotropic exchange interaction

A study of two-dimensional topological vortex-like solitons, for spin nematic states in magnets with spin S = 1 and S = 3/2. Depending on the parameters of the magnet, we get either pure multipole vortices, with a quadrupole parameter for S = 1, or an octupole parameter for S = 3/2, or vortices with...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2015-05, Vol.41 (5), p.382-389
Main Authors: Galkina, E. G., Ivanov, B. A., Kosmachev, O. A., Fridman, Yu. A.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Ferromagnetism
Magnetic moments
Magnetism
Magnets
Parameters
Quadrupoles
Solitary waves
Vortices
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Summary:A study of two-dimensional topological vortex-like solitons, for spin nematic states in magnets with spin S = 1 and S = 3/2. Depending on the parameters of the magnet, we get either pure multipole vortices, with a quadrupole parameter for S = 1, or an octupole parameter for S = 3/2, or vortices with a non-singular core. A vortex core corresponds to a macroscopic area with a disrupted nematic order. A transition to core vortices occurs at critical values of the system parameters. In this case, there is either the formation of a ferromagnetic vortex with a saturated magnetic moment in the core, or a vortex with an antiferromagnetic order at the core. The dynamic properties of the vortex with a ferromagnetic core are characterized by the presence of a gyroforce, whereas vortices with an antiferromagnetic core are Lorentz-invariant, which is typical for sigma-model antiferromagnets.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4921470