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Theory of antiskyrmions in magnets

Skyrmions and antiskyrmions are swirling topological magnetic textures realized as emergent particles in magnets. A skyrmion is stabilized by the Dzyaloshinskii–Moriya interaction in chiral magnets and/or a dipolar interaction in thin film magnets, which prefer the twist of the magnetic moments. Her...

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Autores principales: Koshibae, Wataru, Nagaosa, Naoto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4740186/
https://www.ncbi.nlm.nih.gov/pubmed/26821932
http://dx.doi.org/10.1038/ncomms10542
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author Koshibae, Wataru
Nagaosa, Naoto
author_facet Koshibae, Wataru
Nagaosa, Naoto
author_sort Koshibae, Wataru
collection PubMed
description Skyrmions and antiskyrmions are swirling topological magnetic textures realized as emergent particles in magnets. A skyrmion is stabilized by the Dzyaloshinskii–Moriya interaction in chiral magnets and/or a dipolar interaction in thin film magnets, which prefer the twist of the magnetic moments. Here we show by a numerical simulation of the Landau–Lifshitz–Gilbert equation that pairs of skyrmions and antiskyrmions are created from the helix state as the magnetic field is increased. Antiskyrmions are unstable and disappear immediately in chiral magnets, whereas they are metastable and survive in dipolar magnets. The collision between a skyrmion and an antiskyrmion in a dipolar magnet is also studied. It is found that the collision depends on their relative direction, and the pair annihilation occurs in some cases and only the antiskyrmion is destroyed in the other cases. These results indicate that the antiskyrmion offers a unique opportunity to study particles and antiparticles in condensed-matter systems.
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spelling pubmed-47401862016-03-04 Theory of antiskyrmions in magnets Koshibae, Wataru Nagaosa, Naoto Nat Commun Article Skyrmions and antiskyrmions are swirling topological magnetic textures realized as emergent particles in magnets. A skyrmion is stabilized by the Dzyaloshinskii–Moriya interaction in chiral magnets and/or a dipolar interaction in thin film magnets, which prefer the twist of the magnetic moments. Here we show by a numerical simulation of the Landau–Lifshitz–Gilbert equation that pairs of skyrmions and antiskyrmions are created from the helix state as the magnetic field is increased. Antiskyrmions are unstable and disappear immediately in chiral magnets, whereas they are metastable and survive in dipolar magnets. The collision between a skyrmion and an antiskyrmion in a dipolar magnet is also studied. It is found that the collision depends on their relative direction, and the pair annihilation occurs in some cases and only the antiskyrmion is destroyed in the other cases. These results indicate that the antiskyrmion offers a unique opportunity to study particles and antiparticles in condensed-matter systems. Nature Publishing Group 2016-01-29 /pmc/articles/PMC4740186/ /pubmed/26821932 http://dx.doi.org/10.1038/ncomms10542 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Koshibae, Wataru
Nagaosa, Naoto
Theory of antiskyrmions in magnets
title Theory of antiskyrmions in magnets
title_full Theory of antiskyrmions in magnets
title_fullStr Theory of antiskyrmions in magnets
title_full_unstemmed Theory of antiskyrmions in magnets
title_short Theory of antiskyrmions in magnets
title_sort theory of antiskyrmions in magnets
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4740186/
https://www.ncbi.nlm.nih.gov/pubmed/26821932
http://dx.doi.org/10.1038/ncomms10542
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