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Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice

Designing and constructing model systems that embody the statistical mechanics of frustration is now possible using nanotechnology. We have arranged nanomagnets on a two-dimensional square lattice to form an artificial spin ice, and studied its fractional excitations, emergent magnetic monopoles, an...

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Autores principales: Morley, Sophie A., Porro, Jose Maria, Hrabec, Aleš, Rosamond, Mark C., Venero, Diego Alba, Linfield, Edmund H., Burnell, Gavin, Im, Mi-Young, Fischer, Peter, Langridge, Sean, Marrows, Christopher H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6831649/
https://www.ncbi.nlm.nih.gov/pubmed/31690773
http://dx.doi.org/10.1038/s41598-019-52460-7
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author Morley, Sophie A.
Porro, Jose Maria
Hrabec, Aleš
Rosamond, Mark C.
Venero, Diego Alba
Linfield, Edmund H.
Burnell, Gavin
Im, Mi-Young
Fischer, Peter
Langridge, Sean
Marrows, Christopher H.
author_facet Morley, Sophie A.
Porro, Jose Maria
Hrabec, Aleš
Rosamond, Mark C.
Venero, Diego Alba
Linfield, Edmund H.
Burnell, Gavin
Im, Mi-Young
Fischer, Peter
Langridge, Sean
Marrows, Christopher H.
author_sort Morley, Sophie A.
collection PubMed
description Designing and constructing model systems that embody the statistical mechanics of frustration is now possible using nanotechnology. We have arranged nanomagnets on a two-dimensional square lattice to form an artificial spin ice, and studied its fractional excitations, emergent magnetic monopoles, and how they respond to a driving field using X-ray magnetic microscopy. We observe a regime in which the monopole drift velocity is linear in field above a critical field for the onset of motion. The temperature dependence of the critical field can be described by introducing an interaction term into the Bean-Livingston model of field-assisted barrier hopping. By analogy with electrical charge drift motion, we define and measure a monopole mobility that is larger both for higher temperatures and stronger interactions between nanomagnets. The mobility in this linear regime is described by a creep model of zero-dimensional charges moving within a network of quasi-one-dimensional objects.
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spelling pubmed-68316492019-11-13 Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice Morley, Sophie A. Porro, Jose Maria Hrabec, Aleš Rosamond, Mark C. Venero, Diego Alba Linfield, Edmund H. Burnell, Gavin Im, Mi-Young Fischer, Peter Langridge, Sean Marrows, Christopher H. Sci Rep Article Designing and constructing model systems that embody the statistical mechanics of frustration is now possible using nanotechnology. We have arranged nanomagnets on a two-dimensional square lattice to form an artificial spin ice, and studied its fractional excitations, emergent magnetic monopoles, and how they respond to a driving field using X-ray magnetic microscopy. We observe a regime in which the monopole drift velocity is linear in field above a critical field for the onset of motion. The temperature dependence of the critical field can be described by introducing an interaction term into the Bean-Livingston model of field-assisted barrier hopping. By analogy with electrical charge drift motion, we define and measure a monopole mobility that is larger both for higher temperatures and stronger interactions between nanomagnets. The mobility in this linear regime is described by a creep model of zero-dimensional charges moving within a network of quasi-one-dimensional objects. Nature Publishing Group UK 2019-11-05 /pmc/articles/PMC6831649/ /pubmed/31690773 http://dx.doi.org/10.1038/s41598-019-52460-7 Text en © The Author(s) 2019 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
Morley, Sophie A.
Porro, Jose Maria
Hrabec, Aleš
Rosamond, Mark C.
Venero, Diego Alba
Linfield, Edmund H.
Burnell, Gavin
Im, Mi-Young
Fischer, Peter
Langridge, Sean
Marrows, Christopher H.
Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
title Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
title_full Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
title_fullStr Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
title_full_unstemmed Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
title_short Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
title_sort thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6831649/
https://www.ncbi.nlm.nih.gov/pubmed/31690773
http://dx.doi.org/10.1038/s41598-019-52460-7
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