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Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles

Through evaporation of dense colloids of ferromagnetic ~13 nm ε-Co particles onto carbon substrates, anisotropic magnetic dipolar interactions can support formation of elongated particle structures with aggregate thicknesses of 100–400 nm and lengths of up to some hundred microns. Lorenz microscopy...

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Autores principales: Varón, Miriam, Beleggia, Marco, Jordanovic, Jelena, Schiøtz, Jakob, Kasama, Takeshi, Puntes, Victor F., Frandsen, Cathrine
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4586724/
https://www.ncbi.nlm.nih.gov/pubmed/26416297
http://dx.doi.org/10.1038/srep14536
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author Varón, Miriam
Beleggia, Marco
Jordanovic, Jelena
Schiøtz, Jakob
Kasama, Takeshi
Puntes, Victor F.
Frandsen, Cathrine
author_facet Varón, Miriam
Beleggia, Marco
Jordanovic, Jelena
Schiøtz, Jakob
Kasama, Takeshi
Puntes, Victor F.
Frandsen, Cathrine
author_sort Varón, Miriam
collection PubMed
description Through evaporation of dense colloids of ferromagnetic ~13 nm ε-Co particles onto carbon substrates, anisotropic magnetic dipolar interactions can support formation of elongated particle structures with aggregate thicknesses of 100–400 nm and lengths of up to some hundred microns. Lorenz microscopy and electron holography reveal collective magnetic ordering in these structures. However, in contrast to continuous ferromagnetic thin films of comparable dimensions, domain walls appear preferentially as longitudinal, i.e., oriented parallel to the long axis of the nanoparticle assemblies. We explain this unusual domain structure as the result of dipolar interactions and shape anisotropy, in the absence of inter-particle exchange coupling.
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spelling pubmed-45867242015-09-30 Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles Varón, Miriam Beleggia, Marco Jordanovic, Jelena Schiøtz, Jakob Kasama, Takeshi Puntes, Victor F. Frandsen, Cathrine Sci Rep Article Through evaporation of dense colloids of ferromagnetic ~13 nm ε-Co particles onto carbon substrates, anisotropic magnetic dipolar interactions can support formation of elongated particle structures with aggregate thicknesses of 100–400 nm and lengths of up to some hundred microns. Lorenz microscopy and electron holography reveal collective magnetic ordering in these structures. However, in contrast to continuous ferromagnetic thin films of comparable dimensions, domain walls appear preferentially as longitudinal, i.e., oriented parallel to the long axis of the nanoparticle assemblies. We explain this unusual domain structure as the result of dipolar interactions and shape anisotropy, in the absence of inter-particle exchange coupling. Nature Publishing Group 2015-09-29 /pmc/articles/PMC4586724/ /pubmed/26416297 http://dx.doi.org/10.1038/srep14536 Text en Copyright © 2015, Macmillan Publishers Limited 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
Varón, Miriam
Beleggia, Marco
Jordanovic, Jelena
Schiøtz, Jakob
Kasama, Takeshi
Puntes, Victor F.
Frandsen, Cathrine
Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
title Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
title_full Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
title_fullStr Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
title_full_unstemmed Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
title_short Longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
title_sort longitudinal domain wall formation in elongated assemblies of ferromagnetic nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4586724/
https://www.ncbi.nlm.nih.gov/pubmed/26416297
http://dx.doi.org/10.1038/srep14536
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