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Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping

Finite temperature micromagnetic simulations were used to investigate the magnetisation structure, propagation dynamics and stochastic pinning of domain walls in rare earth-doped Ni(80)Fe(20) nanowires. We first show how the increase of the Gilbert damping, caused by the inclusion rare-earth dopants...

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Autores principales: Broomhall, T. J., Hayward, T. J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5719024/
https://www.ncbi.nlm.nih.gov/pubmed/29213075
http://dx.doi.org/10.1038/s41598-017-17097-4
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author Broomhall, T. J.
Hayward, T. J.
author_facet Broomhall, T. J.
Hayward, T. J.
author_sort Broomhall, T. J.
collection PubMed
description Finite temperature micromagnetic simulations were used to investigate the magnetisation structure, propagation dynamics and stochastic pinning of domain walls in rare earth-doped Ni(80)Fe(20) nanowires. We first show how the increase of the Gilbert damping, caused by the inclusion rare-earth dopants such as holmium, acts to suppress Walker breakdown phenomena. This allows domain walls to maintain consistent magnetisation structures during propagation. We then employ finite temperature simulations to probe how this affects the stochastic pinning of domain walls at notch-shaped artificial defect sites. Our results indicate that the addition of even a few percent of holmium allows domain walls to pin with consistent and well-defined magnetisation configurations, thus suppressing dynamically-induced stochastic pinning/depinning phenomena. Together, these results demonstrate a powerful, materials science-based solution to the problems of stochastic domain wall pinning in soft ferromagnetic nanowires.
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spelling pubmed-57190242017-12-08 Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping Broomhall, T. J. Hayward, T. J. Sci Rep Article Finite temperature micromagnetic simulations were used to investigate the magnetisation structure, propagation dynamics and stochastic pinning of domain walls in rare earth-doped Ni(80)Fe(20) nanowires. We first show how the increase of the Gilbert damping, caused by the inclusion rare-earth dopants such as holmium, acts to suppress Walker breakdown phenomena. This allows domain walls to maintain consistent magnetisation structures during propagation. We then employ finite temperature simulations to probe how this affects the stochastic pinning of domain walls at notch-shaped artificial defect sites. Our results indicate that the addition of even a few percent of holmium allows domain walls to pin with consistent and well-defined magnetisation configurations, thus suppressing dynamically-induced stochastic pinning/depinning phenomena. Together, these results demonstrate a powerful, materials science-based solution to the problems of stochastic domain wall pinning in soft ferromagnetic nanowires. Nature Publishing Group UK 2017-12-06 /pmc/articles/PMC5719024/ /pubmed/29213075 http://dx.doi.org/10.1038/s41598-017-17097-4 Text en © The Author(s) 2017 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
Broomhall, T. J.
Hayward, T. J.
Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping
title Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping
title_full Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping
title_fullStr Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping
title_full_unstemmed Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping
title_short Suppression of Stochastic Domain Wall Pinning Through Control of Gilbert Damping
title_sort suppression of stochastic domain wall pinning through control of gilbert damping
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5719024/
https://www.ncbi.nlm.nih.gov/pubmed/29213075
http://dx.doi.org/10.1038/s41598-017-17097-4
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