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Stability of single skyrmionic bits
The switching between topologically distinct skyrmionic and ferromagnetic states has been proposed as a bit operation for information storage. While long lifetimes of the bits are required for data storage devices, the lifetimes of skyrmions have not been addressed so far. Here we show by means of a...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Pub. Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4634135/ https://www.ncbi.nlm.nih.gov/pubmed/26465211 http://dx.doi.org/10.1038/ncomms9455 |
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author | Hagemeister, J. Romming, N. von Bergmann, K. Vedmedenko, E. Y. Wiesendanger, R. |
author_facet | Hagemeister, J. Romming, N. von Bergmann, K. Vedmedenko, E. Y. Wiesendanger, R. |
author_sort | Hagemeister, J. |
collection | PubMed |
description | The switching between topologically distinct skyrmionic and ferromagnetic states has been proposed as a bit operation for information storage. While long lifetimes of the bits are required for data storage devices, the lifetimes of skyrmions have not been addressed so far. Here we show by means of atomistic Monte Carlo simulations that the field-dependent mean lifetimes of the skyrmionic and ferromagnetic states have a high asymmetry with respect to the critical magnetic field, at which these lifetimes are identical. According to our calculations, the main reason for the enhanced stability of skyrmions is a different field dependence of skyrmionic and ferromagnetic activation energies and a lower attempt frequency of skyrmions rather than the height of energy barriers. We use this knowledge to propose a procedure for the determination of effective material parameters and the quantification of the Monte Carlo timescale from the comparison of theoretical and experimental data. |
format | Online Article Text |
id | pubmed-4634135 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Pub. Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-46341352015-11-25 Stability of single skyrmionic bits Hagemeister, J. Romming, N. von Bergmann, K. Vedmedenko, E. Y. Wiesendanger, R. Nat Commun Article The switching between topologically distinct skyrmionic and ferromagnetic states has been proposed as a bit operation for information storage. While long lifetimes of the bits are required for data storage devices, the lifetimes of skyrmions have not been addressed so far. Here we show by means of atomistic Monte Carlo simulations that the field-dependent mean lifetimes of the skyrmionic and ferromagnetic states have a high asymmetry with respect to the critical magnetic field, at which these lifetimes are identical. According to our calculations, the main reason for the enhanced stability of skyrmions is a different field dependence of skyrmionic and ferromagnetic activation energies and a lower attempt frequency of skyrmions rather than the height of energy barriers. We use this knowledge to propose a procedure for the determination of effective material parameters and the quantification of the Monte Carlo timescale from the comparison of theoretical and experimental data. Nature Pub. Group 2015-10-14 /pmc/articles/PMC4634135/ /pubmed/26465211 http://dx.doi.org/10.1038/ncomms9455 Text en Copyright © 2015, 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 Hagemeister, J. Romming, N. von Bergmann, K. Vedmedenko, E. Y. Wiesendanger, R. Stability of single skyrmionic bits |
title | Stability of single skyrmionic bits |
title_full | Stability of single skyrmionic bits |
title_fullStr | Stability of single skyrmionic bits |
title_full_unstemmed | Stability of single skyrmionic bits |
title_short | Stability of single skyrmionic bits |
title_sort | stability of single skyrmionic bits |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4634135/ https://www.ncbi.nlm.nih.gov/pubmed/26465211 http://dx.doi.org/10.1038/ncomms9455 |
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