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Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure

Magnetic skyrmion is a swirling topological spin texture behaving as an individual particle. It shows a gyro-motion similarly to that of a charged particle under a magnetic field, being led to the transverse shift to the electric current, i.e., skyrmion Hall effect. With the open boundaries of a sam...

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Autores principales: Sugimoto, Satoshi, Koshibae, Wataru, Kasai, Shinya, Ogawa, Naoki, Takahashi, Yukiko, Nagaosa, Naoto, Tokura, Yoshinori
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6978358/
https://www.ncbi.nlm.nih.gov/pubmed/31974469
http://dx.doi.org/10.1038/s41598-020-57818-w
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author Sugimoto, Satoshi
Koshibae, Wataru
Kasai, Shinya
Ogawa, Naoki
Takahashi, Yukiko
Nagaosa, Naoto
Tokura, Yoshinori
author_facet Sugimoto, Satoshi
Koshibae, Wataru
Kasai, Shinya
Ogawa, Naoki
Takahashi, Yukiko
Nagaosa, Naoto
Tokura, Yoshinori
author_sort Sugimoto, Satoshi
collection PubMed
description Magnetic skyrmion is a swirling topological spin texture behaving as an individual particle. It shows a gyro-motion similarly to that of a charged particle under a magnetic field, being led to the transverse shift to the electric current, i.e., skyrmion Hall effect. With the open boundaries of a sample, this results in an accumulation of skyrmions on one side and their depletion on the other side. Here we demonstrate experimentally that this effect propagates non-locally over tens of micrometers even where the electric current is absent, when the narrow wires bridge bar-shaped Pt/Co/Ir heterostructure thin film systems. This nonlocality can be understood in terms of the “chemical potential” gradient for the skyrmion bubble induced by the skyrmion Hall effect in the nonequilibrium steady state under the electric current. The present result shows that the skyrmion Hall effect acts as the skyrmion pump and the thermodynamic concepts can be applied to the aggregate of skyrmion bubbles.
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spelling pubmed-69783582020-01-30 Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure Sugimoto, Satoshi Koshibae, Wataru Kasai, Shinya Ogawa, Naoki Takahashi, Yukiko Nagaosa, Naoto Tokura, Yoshinori Sci Rep Article Magnetic skyrmion is a swirling topological spin texture behaving as an individual particle. It shows a gyro-motion similarly to that of a charged particle under a magnetic field, being led to the transverse shift to the electric current, i.e., skyrmion Hall effect. With the open boundaries of a sample, this results in an accumulation of skyrmions on one side and their depletion on the other side. Here we demonstrate experimentally that this effect propagates non-locally over tens of micrometers even where the electric current is absent, when the narrow wires bridge bar-shaped Pt/Co/Ir heterostructure thin film systems. This nonlocality can be understood in terms of the “chemical potential” gradient for the skyrmion bubble induced by the skyrmion Hall effect in the nonequilibrium steady state under the electric current. The present result shows that the skyrmion Hall effect acts as the skyrmion pump and the thermodynamic concepts can be applied to the aggregate of skyrmion bubbles. Nature Publishing Group UK 2020-01-23 /pmc/articles/PMC6978358/ /pubmed/31974469 http://dx.doi.org/10.1038/s41598-020-57818-w Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Sugimoto, Satoshi
Koshibae, Wataru
Kasai, Shinya
Ogawa, Naoki
Takahashi, Yukiko
Nagaosa, Naoto
Tokura, Yoshinori
Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure
title Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure
title_full Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure
title_fullStr Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure
title_full_unstemmed Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure
title_short Nonlocal accumulation, chemical potential, and Hall effect of skyrmions in Pt/Co/Ir heterostructure
title_sort nonlocal accumulation, chemical potential, and hall effect of skyrmions in pt/co/ir heterostructure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6978358/
https://www.ncbi.nlm.nih.gov/pubmed/31974469
http://dx.doi.org/10.1038/s41598-020-57818-w
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